diff --git a/libc/fuzzing/__support/CMakeLists.txt b/libc/fuzzing/__support/CMakeLists.txt
index 278e914e3fbe95..d4f6db71fdd849 100644
--- a/libc/fuzzing/__support/CMakeLists.txt
+++ b/libc/fuzzing/__support/CMakeLists.txt
@@ -3,5 +3,5 @@ add_libc_fuzzer(
   SRCS
     uint_fuzz.cpp
   DEPENDS
-    libc.src.__support.uint
+    libc.src.__support.big_int
 )
diff --git a/libc/fuzzing/__support/uint_fuzz.cpp b/libc/fuzzing/__support/uint_fuzz.cpp
index f48f00d3b4ba11..07149f511b8386 100644
--- a/libc/fuzzing/__support/uint_fuzz.cpp
+++ b/libc/fuzzing/__support/uint_fuzz.cpp
@@ -1,5 +1,5 @@
 #include "src/__support/CPP/bit.h"
-#include "src/__support/UInt.h"
+#include "src/__support/big_int.h"
 #include "src/string/memory_utils/inline_memcpy.h"
 
 using namespace LIBC_NAMESPACE;
diff --git a/libc/src/__support/CMakeLists.txt b/libc/src/__support/CMakeLists.txt
index 7b1820d9bf3538..dcae55e050bf1f 100644
--- a/libc/src/__support/CMakeLists.txt
+++ b/libc/src/__support/CMakeLists.txt
@@ -104,7 +104,7 @@ add_header_library(
   HDRS
     integer_to_string.h
   DEPENDS
-    .uint
+    .big_int
     libc.src.__support.common
     libc.src.__support.CPP.algorithm
     libc.src.__support.CPP.limits
@@ -204,9 +204,9 @@ add_header_library(
 )
 
 add_header_library(
-  uint
+  big_int
   HDRS
-    UInt.h
+    big_int.h
   DEPENDS
     .math_extras
     .number_pair
@@ -220,9 +220,9 @@ add_header_library(
 add_header_library(
   uint128
   HDRS
-    UInt128.h
+    uint128.h
   DEPENDS
-    .uint
+    .big_int
     libc.src.__support.macros.properties.types
 )
 
diff --git a/libc/src/__support/FPUtil/BasicOperations.h b/libc/src/__support/FPUtil/BasicOperations.h
index 6e4156497618e2..e5ac101fedc0e3 100644
--- a/libc/src/__support/FPUtil/BasicOperations.h
+++ b/libc/src/__support/FPUtil/BasicOperations.h
@@ -14,9 +14,9 @@
 
 #include "FEnvImpl.h"
 #include "src/__support/CPP/type_traits.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/common.h"
 #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/uint128.h"
 
 namespace LIBC_NAMESPACE {
 namespace fputil {
diff --git a/libc/src/__support/FPUtil/CMakeLists.txt b/libc/src/__support/FPUtil/CMakeLists.txt
index 1af236ed9d6bc1..c75a7cd7e09717 100644
--- a/libc/src/__support/FPUtil/CMakeLists.txt
+++ b/libc/src/__support/FPUtil/CMakeLists.txt
@@ -200,8 +200,8 @@ add_header_library(
   DEPENDS
     .fp_bits
     .multiply_add
+    libc.src.__support.big_int
     libc.src.__support.common
-    libc.src.__support.uint
     libc.src.__support.macros.optimization
 )
 
diff --git a/libc/src/__support/FPUtil/FPBits.h b/libc/src/__support/FPUtil/FPBits.h
index 155bff2f558102..ab050360c353b0 100644
--- a/libc/src/__support/FPUtil/FPBits.h
+++ b/libc/src/__support/FPUtil/FPBits.h
@@ -11,13 +11,13 @@
 
 #include "src/__support/CPP/bit.h"
 #include "src/__support/CPP/type_traits.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/common.h"
 #include "src/__support/libc_assert.h"       // LIBC_ASSERT
 #include "src/__support/macros/attributes.h" // LIBC_INLINE, LIBC_INLINE_VAR
 #include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_FLOAT128
 #include "src/__support/math_extras.h"             // mask_trailing_ones
 #include "src/__support/sign.h"                    // Sign
+#include "src/__support/uint128.h"
 
 #include <stdint.h>
 
diff --git a/libc/src/__support/FPUtil/Hypot.h b/libc/src/__support/FPUtil/Hypot.h
index 2e699657346446..76b1f079762136 100644
--- a/libc/src/__support/FPUtil/Hypot.h
+++ b/libc/src/__support/FPUtil/Hypot.h
@@ -15,8 +15,8 @@
 #include "rounding_mode.h"
 #include "src/__support/CPP/bit.h"
 #include "src/__support/CPP/type_traits.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/common.h"
+#include "src/__support/uint128.h"
 
 namespace LIBC_NAMESPACE {
 namespace fputil {
diff --git a/libc/src/__support/FPUtil/dyadic_float.h b/libc/src/__support/FPUtil/dyadic_float.h
index e0c205f52383ba..49fb11971104b3 100644
--- a/libc/src/__support/FPUtil/dyadic_float.h
+++ b/libc/src/__support/FPUtil/dyadic_float.h
@@ -12,7 +12,7 @@
 #include "FPBits.h"
 #include "multiply_add.h"
 #include "src/__support/CPP/type_traits.h"
-#include "src/__support/UInt.h"
+#include "src/__support/big_int.h"
 #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
 
 #include <stddef.h>
diff --git a/libc/src/__support/FPUtil/generic/FMA.h b/libc/src/__support/FPUtil/generic/FMA.h
index f03af9246337ff..f403aa7333b394 100644
--- a/libc/src/__support/FPUtil/generic/FMA.h
+++ b/libc/src/__support/FPUtil/generic/FMA.h
@@ -14,9 +14,9 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/rounding_mode.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/macros/attributes.h"   // LIBC_INLINE
 #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/uint128.h"
 
 namespace LIBC_NAMESPACE {
 namespace fputil {
diff --git a/libc/src/__support/FPUtil/generic/sqrt.h b/libc/src/__support/FPUtil/generic/sqrt.h
index b6b4aaecb2ccc1..7e7600ba6502a9 100644
--- a/libc/src/__support/FPUtil/generic/sqrt.h
+++ b/libc/src/__support/FPUtil/generic/sqrt.h
@@ -15,8 +15,8 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/rounding_mode.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/common.h"
+#include "src/__support/uint128.h"
 
 namespace LIBC_NAMESPACE {
 namespace fputil {
diff --git a/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h b/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h
index 656ade4f773535..6308ffe95493e0 100644
--- a/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h
+++ b/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h
@@ -13,8 +13,8 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/rounding_mode.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/common.h"
+#include "src/__support/uint128.h"
 
 namespace LIBC_NAMESPACE {
 namespace fputil {
diff --git a/libc/src/__support/UInt.h b/libc/src/__support/big_int.h
similarity index 100%
rename from libc/src/__support/UInt.h
rename to libc/src/__support/big_int.h
diff --git a/libc/src/__support/float_to_string.h b/libc/src/__support/float_to_string.h
index 4c59cfd99c2e6c..09b13324f25bbd 100644
--- a/libc/src/__support/float_to_string.h
+++ b/libc/src/__support/float_to_string.h
@@ -15,7 +15,7 @@
 #include "src/__support/CPP/type_traits.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/dyadic_float.h"
-#include "src/__support/UInt.h"
+#include "src/__support/big_int.h"
 #include "src/__support/common.h"
 #include "src/__support/libc_assert.h"
 #include "src/__support/macros/attributes.h"
diff --git a/libc/src/__support/hash.h b/libc/src/__support/hash.h
index 6b362ba8318910..d1218fdc25927f 100644
--- a/libc/src/__support/hash.h
+++ b/libc/src/__support/hash.h
@@ -11,8 +11,8 @@
 
 #include "src/__support/CPP/bit.h"           // rotl
 #include "src/__support/CPP/limits.h"        // numeric_limits
-#include "src/__support/UInt128.h"           // UInt128
 #include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/uint128.h"           // UInt128
 #include <stdint.h>                          // For uint64_t
 
 namespace LIBC_NAMESPACE {
diff --git a/libc/src/__support/integer_literals.h b/libc/src/__support/integer_literals.h
index e99799c3512e2f..5fb67464090cef 100644
--- a/libc/src/__support/integer_literals.h
+++ b/libc/src/__support/integer_literals.h
@@ -14,8 +14,8 @@
 #define LLVM_LIBC_SRC___SUPPORT_INTEGER_LITERALS_H
 
 #include "src/__support/CPP/limits.h"        // CHAR_BIT
-#include "src/__support/UInt128.h"           // UInt128
 #include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/uint128.h"           // UInt128
 #include <stddef.h>                          // size_t
 #include <stdint.h>                          // uintxx_t
 
diff --git a/libc/src/__support/integer_to_string.h b/libc/src/__support/integer_to_string.h
index f72d00d1a7456d..375f0e82960e38 100644
--- a/libc/src/__support/integer_to_string.h
+++ b/libc/src/__support/integer_to_string.h
@@ -67,7 +67,7 @@
 #include "src/__support/CPP/span.h"
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/CPP/type_traits.h"
-#include "src/__support/UInt.h" // make_integral_or_big_int_unsigned_t
+#include "src/__support/big_int.h" // make_integral_or_big_int_unsigned_t
 #include "src/__support/common.h"
 
 namespace LIBC_NAMESPACE {
diff --git a/libc/src/__support/str_to_float.h b/libc/src/__support/str_to_float.h
index f622b7edaa8a72..cd0c07629f8766 100644
--- a/libc/src/__support/str_to_float.h
+++ b/libc/src/__support/str_to_float.h
@@ -17,13 +17,13 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/dyadic_float.h"
 #include "src/__support/FPUtil/rounding_mode.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/common.h"
 #include "src/__support/ctype_utils.h"
 #include "src/__support/detailed_powers_of_ten.h"
 #include "src/__support/high_precision_decimal.h"
 #include "src/__support/str_to_integer.h"
 #include "src/__support/str_to_num_result.h"
+#include "src/__support/uint128.h"
 #include "src/errno/libc_errno.h" // For ERANGE
 
 namespace LIBC_NAMESPACE {
diff --git a/libc/src/__support/str_to_integer.h b/libc/src/__support/str_to_integer.h
index 02c71d40a1c0ad..6db851ab0e65a5 100644
--- a/libc/src/__support/str_to_integer.h
+++ b/libc/src/__support/str_to_integer.h
@@ -11,10 +11,10 @@
 
 #include "src/__support/CPP/limits.h"
 #include "src/__support/CPP/type_traits.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/common.h"
 #include "src/__support/ctype_utils.h"
 #include "src/__support/str_to_num_result.h"
+#include "src/__support/uint128.h"
 #include "src/errno/libc_errno.h" // For ERANGE
 
 namespace LIBC_NAMESPACE {
diff --git a/libc/src/__support/UInt128.h b/libc/src/__support/uint128.h
similarity index 97%
rename from libc/src/__support/UInt128.h
rename to libc/src/__support/uint128.h
index b6ef9ca18eb01f..722e79d0802e22 100644
--- a/libc/src/__support/UInt128.h
+++ b/libc/src/__support/uint128.h
@@ -9,7 +9,7 @@
 #ifndef LLVM_LIBC_SRC___SUPPORT_UINT128_H
 #define LLVM_LIBC_SRC___SUPPORT_UINT128_H
 
-#include "UInt.h"
+#include "big_int.h"
 #include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
 #ifdef LIBC_TYPES_HAS_INT128
diff --git a/libc/src/math/generic/log_range_reduction.h b/libc/src/math/generic/log_range_reduction.h
index 64c0fc3aa4f539..d12da47a2cfae7 100644
--- a/libc/src/math/generic/log_range_reduction.h
+++ b/libc/src/math/generic/log_range_reduction.h
@@ -11,7 +11,7 @@
 
 #include "common_constants.h"
 #include "src/__support/FPUtil/dyadic_float.h"
-#include "src/__support/UInt128.h"
+#include "src/__support/uint128.h"
 
 namespace LIBC_NAMESPACE {
 
diff --git a/libc/src/stdio/printf_core/CMakeLists.txt b/libc/src/stdio/printf_core/CMakeLists.txt
index 7db79c54beb0ae..21ff0d43ab7287 100644
--- a/libc/src/stdio/printf_core/CMakeLists.txt
+++ b/libc/src/stdio/printf_core/CMakeLists.txt
@@ -82,21 +82,21 @@ add_object_library(
     float_dec_converter.h
     fixed_converter.h #TODO: Check if this should be disabled when fixed unavail
   DEPENDS
-    .writer
     .core_structs
     .printf_config
+    .writer
+    libc.src.__support.big_int
+    libc.src.__support.common
     libc.src.__support.CPP.limits
     libc.src.__support.CPP.span
     libc.src.__support.CPP.string_view
-    libc.src.__support.FPUtil.fp_bits
+    libc.src.__support.float_to_string
     libc.src.__support.FPUtil.fenv_impl
+    libc.src.__support.FPUtil.fp_bits
     libc.src.__support.FPUtil.rounding_mode
-    libc.src.__support.common
+    libc.src.__support.integer_to_string
     libc.src.__support.libc_assert
-    libc.src.__support.uint
     libc.src.__support.uint128
-    libc.src.__support.integer_to_string
-    libc.src.__support.float_to_string
 )
 
 
diff --git a/libc/src/stdio/printf_core/float_dec_converter.h b/libc/src/stdio/printf_core/float_dec_converter.h
index c4e8aaa2f0e2e9..666e4c9fa75e14 100644
--- a/libc/src/stdio/printf_core/float_dec_converter.h
+++ b/libc/src/stdio/printf_core/float_dec_converter.h
@@ -12,7 +12,7 @@
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/rounding_mode.h"
-#include "src/__support/UInt.h" // is_big_int_v
+#include "src/__support/big_int.h" // is_big_int_v
 #include "src/__support/float_to_string.h"
 #include "src/__support/integer_to_string.h"
 #include "src/__support/libc_assert.h"
diff --git a/libc/test/UnitTest/CMakeLists.txt b/libc/test/UnitTest/CMakeLists.txt
index d830d22bb540e9..4411170502ed69 100644
--- a/libc/test/UnitTest/CMakeLists.txt
+++ b/libc/test/UnitTest/CMakeLists.txt
@@ -68,6 +68,7 @@ add_unittest_framework_library(
     Test.h
     TestLogger.h
   DEPENDS
+    libc.src.__support.big_int
     libc.src.__support.c_string
     libc.src.__support.CPP.string
     libc.src.__support.CPP.string_view
@@ -75,7 +76,6 @@ add_unittest_framework_library(
     libc.src.__support.fixed_point.fx_rep
     libc.src.__support.macros.properties.types
     libc.src.__support.OSUtil.osutil
-    libc.src.__support.uint
     libc.src.__support.uint128
 )
 
@@ -103,9 +103,9 @@ add_header_library(
   HDRS
     StringUtils.h
   DEPENDS
+    libc.src.__support.big_int
     libc.src.__support.CPP.string
     libc.src.__support.CPP.type_traits
-    libc.src.__support.uint
 )
 
 add_unittest_framework_library(
diff --git a/libc/test/UnitTest/LibcTest.cpp b/libc/test/UnitTest/LibcTest.cpp
index 03cd25191ecd5c..846ad331e5237e 100644
--- a/libc/test/UnitTest/LibcTest.cpp
+++ b/libc/test/UnitTest/LibcTest.cpp
@@ -11,9 +11,9 @@
 #include "include/llvm-libc-macros/stdfix-macros.h"
 #include "src/__support/CPP/string.h"
 #include "src/__support/CPP/string_view.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/fixed_point/fx_rep.h"
 #include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
+#include "src/__support/uint128.h"
 #include "test/UnitTest/TestLogger.h"
 
 #if __STDC_HOSTED__
diff --git a/libc/test/UnitTest/StringUtils.h b/libc/test/UnitTest/StringUtils.h
index cab0b58f969058..61d74b49d4c988 100644
--- a/libc/test/UnitTest/StringUtils.h
+++ b/libc/test/UnitTest/StringUtils.h
@@ -11,7 +11,7 @@
 
 #include "src/__support/CPP/string.h"
 #include "src/__support/CPP/type_traits.h"
-#include "src/__support/UInt.h"
+#include "src/__support/big_int.h"
 
 namespace LIBC_NAMESPACE {
 
diff --git a/libc/test/UnitTest/TestLogger.cpp b/libc/test/UnitTest/TestLogger.cpp
index 4756188b46cb0b..feba4b5ddd39b4 100644
--- a/libc/test/UnitTest/TestLogger.cpp
+++ b/libc/test/UnitTest/TestLogger.cpp
@@ -1,10 +1,10 @@
 #include "test/UnitTest/TestLogger.h"
 #include "src/__support/CPP/string.h"
 #include "src/__support/CPP/string_view.h"
-#include "src/__support/OSUtil/io.h" // write_to_stderr
-#include "src/__support/UInt.h"      // is_big_int
-#include "src/__support/UInt128.h"
+#include "src/__support/OSUtil/io.h"               // write_to_stderr
+#include "src/__support/big_int.h"                 // is_big_int
 #include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
+#include "src/__support/uint128.h"
 
 #include <stdint.h>
 
diff --git a/libc/test/src/__support/CMakeLists.txt b/libc/test/src/__support/CMakeLists.txt
index 51b897f8b595a8..02ee91d0dc99a0 100644
--- a/libc/test/src/__support/CMakeLists.txt
+++ b/libc/test/src/__support/CMakeLists.txt
@@ -78,11 +78,11 @@ add_libc_test(
   SRCS
     integer_to_string_test.cpp
   DEPENDS
+    libc.src.__support.big_int
     libc.src.__support.CPP.limits
     libc.src.__support.CPP.string_view
     libc.src.__support.integer_literals
     libc.src.__support.integer_to_string
-    libc.src.__support.uint
     libc.src.__support.uint128
 )
 
@@ -107,9 +107,9 @@ if(NOT LIBC_TARGET_ARCHITECTURE_IS_NVPTX)
     SRCS
       uint_test.cpp
     DEPENDS
+      libc.src.__support.big_int
       libc.src.__support.CPP.optional
       libc.src.__support.macros.properties.types
-      libc.src.__support.uint
   )
 endif()
 
diff --git a/libc/test/src/__support/CPP/CMakeLists.txt b/libc/test/src/__support/CPP/CMakeLists.txt
index 74aa0c705ec467..708548f812c66c 100644
--- a/libc/test/src/__support/CPP/CMakeLists.txt
+++ b/libc/test/src/__support/CPP/CMakeLists.txt
@@ -17,9 +17,9 @@ add_libc_test(
   SRCS
     bit_test.cpp
   DEPENDS
+    libc.src.__support.big_int
     libc.src.__support.CPP.bit
     libc.src.__support.macros.properties.types
-    libc.src.__support.uint
 )
 
 add_libc_test(
@@ -59,9 +59,9 @@ add_libc_test(
   SRCS
     limits_test.cpp
   DEPENDS
+    libc.src.__support.big_int
     libc.src.__support.CPP.limits
     libc.src.__support.macros.properties.types
-    libc.src.__support.uint
 )
 
 add_libc_test(
diff --git a/libc/test/src/__support/CPP/bit_test.cpp b/libc/test/src/__support/CPP/bit_test.cpp
index 875b47e6a1980e..299623d2ca2407 100644
--- a/libc/test/src/__support/CPP/bit_test.cpp
+++ b/libc/test/src/__support/CPP/bit_test.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/CPP/bit.h"
-#include "src/__support/UInt.h"
+#include "src/__support/big_int.h"
 #include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 #include "test/UnitTest/Test.h"
 
diff --git a/libc/test/src/__support/CPP/limits_test.cpp b/libc/test/src/__support/CPP/limits_test.cpp
index efcd6839d07337..bcf7d5ed6a6e78 100644
--- a/libc/test/src/__support/CPP/limits_test.cpp
+++ b/libc/test/src/__support/CPP/limits_test.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/CPP/limits.h"
-#include "src/__support/UInt.h"
+#include "src/__support/big_int.h"
 #include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 #include "test/UnitTest/Test.h"
 
diff --git a/libc/test/src/__support/FPUtil/dyadic_float_test.cpp b/libc/test/src/__support/FPUtil/dyadic_float_test.cpp
index 5ee9aaad563827..809381ed47b59b 100644
--- a/libc/test/src/__support/FPUtil/dyadic_float_test.cpp
+++ b/libc/test/src/__support/FPUtil/dyadic_float_test.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/FPUtil/dyadic_float.h"
-#include "src/__support/UInt.h"
+#include "src/__support/big_int.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
diff --git a/libc/test/src/__support/high_precision_decimal_test.cpp b/libc/test/src/__support/high_precision_decimal_test.cpp
index 2bb28bcdab0212..7a3c323b06d511 100644
--- a/libc/test/src/__support/high_precision_decimal_test.cpp
+++ b/libc/test/src/__support/high_precision_decimal_test.cpp
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/__support/UInt128.h"
 #include "src/__support/high_precision_decimal.h"
+#include "src/__support/uint128.h"
 
 #include "test/UnitTest/Test.h"
 
diff --git a/libc/test/src/__support/integer_to_string_test.cpp b/libc/test/src/__support/integer_to_string_test.cpp
index 270fddd828b680..e644751b56c933 100644
--- a/libc/test/src/__support/integer_to_string_test.cpp
+++ b/libc/test/src/__support/integer_to_string_test.cpp
@@ -9,10 +9,10 @@
 #include "src/__support/CPP/limits.h"
 #include "src/__support/CPP/span.h"
 #include "src/__support/CPP/string_view.h"
-#include "src/__support/UInt.h"
-#include "src/__support/UInt128.h"
+#include "src/__support/big_int.h"
 #include "src/__support/integer_literals.h"
 #include "src/__support/integer_to_string.h"
+#include "src/__support/uint128.h"
 
 #include "test/UnitTest/Test.h"
 
diff --git a/libc/test/src/__support/math_extras_test.cpp b/libc/test/src/__support/math_extras_test.cpp
index 401e631ea4bac1..0047888965177e 100644
--- a/libc/test/src/__support/math_extras_test.cpp
+++ b/libc/test/src/__support/math_extras_test.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/__support/UInt128.h" // UInt<128>
 #include "src/__support/integer_literals.h"
 #include "src/__support/math_extras.h"
+#include "src/__support/uint128.h" // UInt<128>
 #include "test/UnitTest/Test.h"
 
 namespace LIBC_NAMESPACE {
diff --git a/libc/test/src/__support/str_to_fp_test.h b/libc/test/src/__support/str_to_fp_test.h
index bddff035fdd162..8d6181cda884be 100644
--- a/libc/test/src/__support/str_to_fp_test.h
+++ b/libc/test/src/__support/str_to_fp_test.h
@@ -7,8 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/FPUtil/FPBits.h"
-#include "src/__support/UInt128.h"
 #include "src/__support/str_to_float.h"
+#include "src/__support/uint128.h"
 #include "src/errno/libc_errno.h"
 
 #include "test/UnitTest/Test.h"
diff --git a/libc/test/src/__support/uint_test.cpp b/libc/test/src/__support/uint_test.cpp
index 7f278619b8c9f3..fadec0cc313b16 100644
--- a/libc/test/src/__support/uint_test.cpp
+++ b/libc/test/src/__support/uint_test.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/CPP/optional.h"
-#include "src/__support/UInt.h"
+#include "src/__support/big_int.h"
 #include "src/__support/integer_literals.h"        // parse_unsigned_bigint
 #include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
 
diff --git a/libc/test/src/math/smoke/nanf128_test.cpp b/libc/test/src/math/smoke/nanf128_test.cpp
index 2a9f57de5b43bc..652e35ccb53d7a 100644
--- a/libc/test/src/math/smoke/nanf128_test.cpp
+++ b/libc/test/src/math/smoke/nanf128_test.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/FPUtil/FPBits.h"
-#include "src/__support/UInt128.h"
+#include "src/__support/uint128.h"
 #include "src/math/nanf128.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
diff --git a/libc/test/src/stdlib/strtold_test.cpp b/libc/test/src/stdlib/strtold_test.cpp
index 2066e9635aba1e..2c9f542930bf86 100644
--- a/libc/test/src/stdlib/strtold_test.cpp
+++ b/libc/test/src/stdlib/strtold_test.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/FPUtil/FPBits.h"
-#include "src/__support/UInt128.h"
+#include "src/__support/uint128.h"
 #include "src/errno/libc_errno.h"
 #include "src/stdlib/strtold.h"
 
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index 1fb93cac42b932..fd5309e688c30e 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -113,7 +113,6 @@ libc_support_library(
     hdrs = ["hdr/math_macros.h"],
 )
 
-
 ############################### Support libraries ##############################
 
 libc_support_library(
@@ -484,12 +483,12 @@ libc_support_library(
         "src/__support/ryu_long_double_constants.h",
     ],
     deps = [
+        ":__support_big_int",
         ":__support_common",
         ":__support_cpp_type_traits",
         ":__support_fputil_dyadic_float",
         ":__support_fputil_fp_bits",
         ":__support_libc_assert",
-        ":__support_uint",
     ],
 )
 
@@ -502,8 +501,8 @@ libc_support_library(
 )
 
 libc_support_library(
-    name = "__support_uint",
-    hdrs = ["src/__support/UInt.h"],
+    name = "__support_big_int",
+    hdrs = ["src/__support/big_int.h"],
     deps = [
         ":__support_cpp_array",
         ":__support_cpp_bit",
@@ -528,11 +527,11 @@ libc_support_library(
 
 libc_support_library(
     name = "__support_uint128",
-    hdrs = ["src/__support/UInt128.h"],
+    hdrs = ["src/__support/uint128.h"],
     deps = [
+        ":__support_big_int",
         ":__support_macros_attributes",
         ":__support_macros_properties_types",
-        ":__support_uint",
     ],
 )
 
@@ -561,6 +560,7 @@ libc_support_library(
     name = "__support_integer_to_string",
     hdrs = ["src/__support/integer_to_string.h"],
     deps = [
+        ":__support_big_int",
         ":__support_common",
         ":__support_cpp_algorithm",
         ":__support_cpp_bit",
@@ -569,7 +569,6 @@ libc_support_library(
         ":__support_cpp_span",
         ":__support_cpp_string_view",
         ":__support_cpp_type_traits",
-        ":__support_uint",
     ],
 )
 
@@ -973,11 +972,11 @@ libc_support_library(
     name = "__support_fputil_dyadic_float",
     hdrs = ["src/__support/FPUtil/dyadic_float.h"],
     deps = [
+        ":__support_big_int",
         ":__support_common",
         ":__support_fputil_fp_bits",
         ":__support_fputil_multiply_add",
         ":__support_macros_optimization",
-        ":__support_uint",
     ],
 )
 
@@ -3223,6 +3222,7 @@ libc_support_library(
     ],
     defines = PRINTF_COPTS,
     deps = [
+        ":__support_big_int",
         ":__support_common",
         ":__support_cpp_limits",
         ":__support_cpp_span",
@@ -3233,7 +3233,6 @@ libc_support_library(
         ":__support_fputil_rounding_mode",
         ":__support_integer_to_string",
         ":__support_libc_assert",
-        ":__support_uint",
         ":__support_uint128",
         ":printf_config",
         ":printf_core_structs",
diff --git a/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel
index 7d77b6114464f0..2fc7e36aebb43e 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel
@@ -15,11 +15,11 @@ libc_support_library(
     srcs = ["TestLogger.cpp"],
     hdrs = ["TestLogger.h"],
     deps = [
+        "//libc:__support_big_int",
         "//libc:__support_cpp_string",
         "//libc:__support_cpp_string_view",
         "//libc:__support_macros_properties_types",
         "//libc:__support_osutil_io",
-        "//libc:__support_uint",
         "//libc:__support_uint128",
     ],
 )
@@ -128,8 +128,8 @@ libc_support_library(
         "StringUtils.h",
     ],
     deps = [
+        "//libc:__support_big_int",
         "//libc:__support_cpp_string",
         "//libc:__support_cpp_type_traits",
-        "//libc:__support_uint",
     ],
 )
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
index 9e1b25e10d6ce2..0ed5951904a0e4 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
@@ -64,12 +64,12 @@ libc_test(
     name = "integer_to_string_test",
     srcs = ["integer_to_string_test.cpp"],
     deps = [
+        "//libc:__support_big_int",
         "//libc:__support_cpp_limits",
         "//libc:__support_cpp_span",
         "//libc:__support_cpp_string_view",
         "//libc:__support_integer_literals",
         "//libc:__support_integer_to_string",
-        "//libc:__support_uint",
         "//libc:__support_uint128",
     ],
 )
@@ -86,11 +86,12 @@ libc_test(
     name = "uint_test",
     srcs = ["uint_test.cpp"],
     deps = [
+        "//libc:__support_big_int",
         "//libc:__support_cpp_optional",
         "//libc:__support_integer_literals",
         "//libc:__support_macros_properties_types",
-        "//libc:__support_uint",
         "//libc:hdr_math_macros",
+        "//libc:llvm_libc_macros_math_macros",
     ],
 )
 
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/__support/CPP/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/__support/CPP/BUILD.bazel
index dad1c7708e448d..96dafbc6da4854 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/__support/CPP/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/__support/CPP/BUILD.bazel
@@ -26,9 +26,9 @@ libc_test(
     name = "bit_test",
     srcs = ["bit_test.cpp"],
     deps = [
+        "//libc:__support_big_int",
         "//libc:__support_cpp_bit",
         "//libc:__support_macros_properties_types",
-        "//libc:__support_uint",
     ],
 )
 
@@ -48,9 +48,9 @@ libc_test(
     name = "limits_test",
     srcs = ["limits_test.cpp"],
     deps = [
+        "//libc:__support_big_int",
         "//libc:__support_cpp_limits",
         "//libc:__support_macros_properties_types",
-        "//libc:__support_uint",
     ],
 )
 
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/__support/FPUtil/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/__support/FPUtil/BUILD.bazel
index 18683e42724a54..132c146b507b1a 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/__support/FPUtil/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/__support/FPUtil/BUILD.bazel
@@ -26,8 +26,8 @@ libc_test(
     srcs = ["dyadic_float_test.cpp"],
     copts = ["-frounding-math"],
     deps = [
+        "//libc:__support_big_int",
         "//libc:__support_fputil_dyadic_float",
-        "//libc:__support_uint",
         "//libc:__support_uint128",
         "//libc/test/UnitTest:fp_test_helpers",
         "//libc/utils/MPFRWrapper:mpfr_wrapper",