diff --git a/src/Functions/UserDefined/UDFHelper.cpp b/src/Functions/UserDefined/UDFHelper.cpp
index 0e4072d1042..fec7addfef5 100644
--- a/src/Functions/UserDefined/UDFHelper.cpp
+++ b/src/Functions/UserDefined/UDFHelper.cpp
@@ -1,5 +1,6 @@
 #include <Functions/UserDefined/UDFHelper.h>
 
+#include <AggregateFunctions/AggregateFunctionCombinatorFactory.h>
 #include <DataTypes/DataTypeFactory.h>
 #include <Functions/UserDefined/IUserDefinedSQLObjectsLoader.h>
 #include <Functions/UserDefined/UserDefinedExecutableFunction.h>
@@ -51,6 +52,9 @@ void validateUDFName(const String & func_name)
 
     if (!std::isalpha(func_name[0]) && func_name[0] != '_')
         throw Exception(ErrorCodes::UDF_INVALID_NAME, "UDF name's first char shall be an alphabetic or underscore");
+
+    if (AggregateFunctionCombinatorPtr combinator = AggregateFunctionCombinatorFactory::instance().tryFindSuffix(func_name))
+        throw Exception(fmt::format("UDF name can not end up with {}, because it is key word suffix", combinator->getName()), ErrorCodes::UDF_INVALID_NAME);
 }
 
 namespace