diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
index 675d62b9a6aa8..4cd68a0c89fb3 100644
--- a/activemodel/lib/active_model/naming.rb
+++ b/activemodel/lib/active_model/naming.rb
@@ -2,11 +2,11 @@
 
 module ActiveModel
   class Name < String
-    attr_reader :singular, :plural, :element, :collection, :partial_path, :human
+    attr_reader :singular, :plural, :element, :collection, :partial_path
     alias_method :cache_key, :collection
 
-    def initialize(klass, name)
-      super(name)
+    def initialize(klass)
+      super(klass.name)
       @klass = klass
       @singular = ActiveSupport::Inflector.underscore(self).tr('/', '_').freeze
       @plural = ActiveSupport::Inflector.pluralize(@singular).freeze
@@ -15,13 +15,31 @@ def initialize(klass, name)
       @collection = ActiveSupport::Inflector.tableize(self).freeze
       @partial_path = "#{@collection}/#{@element}".freeze
     end
+
+    # Transform the model name into a more humane format, using I18n. By default,
+    # it will underscore then humanize the class name (BlogPost.model_name.human #=> "Blog post").
+    # Specify +options+ with additional translating options.
+    def human(options={})
+      return @human unless @klass.respond_to?(:lookup_ancestors) &&
+                           @klass.respond_to?(:i18n_scope)
+
+      defaults = @klass.lookup_ancestors.map do |klass|
+        klass.model_name.underscore.to_sym
+      end
+
+      defaults << options.delete(:default) if options[:default]
+      defaults << @human
+
+      options.reverse_merge! :scope => [@klass.i18n_scope, :models], :count => 1, :default => defaults
+      I18n.translate(defaults.shift, options)
+    end
   end
 
   module Naming
     # Returns an ActiveModel::Name object for module. It can be
     # used to retrieve all kinds of naming-related information.
     def model_name
-      @_model_name ||= ActiveModel::Name.new(self, name)
+      @_model_name ||= ActiveModel::Name.new(self)
     end
   end
 end
diff --git a/activemodel/lib/active_model/translation.rb b/activemodel/lib/active_model/translation.rb
index 42ca463f82c38..e5ef1e61141ac 100644
--- a/activemodel/lib/active_model/translation.rb
+++ b/activemodel/lib/active_model/translation.rb
@@ -37,28 +37,8 @@ def human_attribute_name(attribute, options = {})
 
     # Model.human_name is deprecated. Use Model.model_name.human instead.
     def human_name(*args)
-      ActiveSupport::Deprecation.warn("human_name has been deprecated, please use model_name.human instead", caller[0,1])
+      ActiveSupport::Deprecation.warn("human_name has been deprecated, please use model_name.human instead", caller[0,5])
       model_name.human(*args)
     end
   end
-
-  class Name < String
-    # Transform the model name into a more humane format, using I18n. By default,
-    # it will underscore then humanize the class name (BlogPost.human_name #=> "Blog post").
-    # Specify +options+ with additional translating options.
-    def human(options={})
-      return @human unless @klass.respond_to?(:lookup_ancestors) &&
-                           @klass.respond_to?(:i18n_scope)
-
-      defaults = @klass.lookup_ancestors.map do |klass|
-        klass.model_name.underscore.to_sym
-      end
-
-      defaults << options.delete(:default) if options[:default]
-      defaults << @human
-
-      options.reverse_merge! :scope => [@klass.i18n_scope, :models], :count => 1, :default => defaults
-      I18n.translate(defaults.shift, options)
-    end
-  end
 end
diff --git a/activemodel/test/cases/naming_test.rb b/activemodel/test/cases/naming_test.rb
index fe1ea364502a0..dc39b84ed8cb2 100644
--- a/activemodel/test/cases/naming_test.rb
+++ b/activemodel/test/cases/naming_test.rb
@@ -1,8 +1,9 @@
 require 'cases/helper'
+require 'models/track_back'
 
 class NamingTest < ActiveModel::TestCase
   def setup
-    @model_name = ActiveModel::Name.new(self, 'Post::TrackBack')
+    @model_name = ActiveModel::Name.new(Post::TrackBack)
   end
 
   def test_singular
diff --git a/activemodel/test/cases/translation_test.rb b/activemodel/test/cases/translation_test.rb
index d171784963573..bfc1ca12e6926 100644
--- a/activemodel/test/cases/translation_test.rb
+++ b/activemodel/test/cases/translation_test.rb
@@ -1,11 +1,5 @@
 require 'cases/helper'
-
-class SuperUser
-  extend ActiveModel::Translation
-end
-
-class User < SuperUser
-end
+require 'models/person'
 
 class ActiveModelI18nTests < ActiveModel::TestCase
 
@@ -14,38 +8,38 @@ def setup
   end
   
   def test_translated_model_attributes
-    I18n.backend.store_translations 'en', :activemodel => {:attributes => {:super_user => {:name => 'super_user name attribute'} } }
-    assert_equal 'super_user name attribute', SuperUser.human_attribute_name('name')
+    I18n.backend.store_translations 'en', :activemodel => {:attributes => {:person => {:name => 'person name attribute'} } }
+    assert_equal 'person name attribute', Person.human_attribute_name('name')
   end
   
   def test_translated_model_attributes_with_symbols
-    I18n.backend.store_translations 'en', :activemodel => {:attributes => {:super_user => {:name => 'super_user name attribute'} } }
-    assert_equal 'super_user name attribute', SuperUser.human_attribute_name(:name)
+    I18n.backend.store_translations 'en', :activemodel => {:attributes => {:person => {:name => 'person name attribute'} } }
+    assert_equal 'person name attribute', Person.human_attribute_name(:name)
   end
 
   def test_translated_model_attributes_with_ancestor
-    I18n.backend.store_translations 'en', :activemodel => {:attributes => {:user => {:name => 'user name attribute'} } }
-    assert_equal 'user name attribute', User.human_attribute_name('name')
+    I18n.backend.store_translations 'en', :activemodel => {:attributes => {:child => {:name => 'child name attribute'} } }
+    assert_equal 'child name attribute', Child.human_attribute_name('name')
   end
 
   def test_translated_model_attributes_with_ancestors_fallback
-    I18n.backend.store_translations 'en', :activemodel => {:attributes => {:super_user => {:name => 'super_user name attribute'} } }
-    assert_equal 'super_user name attribute', User.human_attribute_name('name')
+    I18n.backend.store_translations 'en', :activemodel => {:attributes => {:person => {:name => 'person name attribute'} } }
+    assert_equal 'person name attribute', Child.human_attribute_name('name')
   end
 
   def test_translated_model_names
-    I18n.backend.store_translations 'en', :activemodel => {:models => {:super_user => 'super_user model'} }
-    assert_equal 'super_user model', SuperUser.model_name.human
+    I18n.backend.store_translations 'en', :activemodel => {:models => {:person => 'person model'} }
+    assert_equal 'person model', Person.model_name.human
   end
 
   def test_translated_model_names_with_sti
-    I18n.backend.store_translations 'en', :activemodel => {:models => {:user => 'user model'} }
-    assert_equal 'user model', User.model_name.human
+    I18n.backend.store_translations 'en', :activemodel => {:models => {:child => 'child model'} }
+    assert_equal 'child model', Child.model_name.human
   end
 
   def test_translated_model_names_with_ancestors_fallback
-    I18n.backend.store_translations 'en', :activemodel => {:models => {:super_user => 'super_user model'} }
-    assert_equal 'super_user model', User.model_name.human
+    I18n.backend.store_translations 'en', :activemodel => {:models => {:person => 'person model'} }
+    assert_equal 'person model', Child.model_name.human
   end
 end
 
diff --git a/activemodel/test/models/person.rb b/activemodel/test/models/person.rb
index d98420f9005e2..fad29a51ecbfc 100644
--- a/activemodel/test/models/person.rb
+++ b/activemodel/test/models/person.rb
@@ -1,5 +1,9 @@
 class Person
   include ActiveModel::Validations
+  extend  ActiveModel::Translation
 
   attr_accessor :title, :karma
 end
+
+class Child < Person
+end
diff --git a/activemodel/test/models/track_back.rb b/activemodel/test/models/track_back.rb
new file mode 100644
index 0000000000000..d137e4ff8f97e
--- /dev/null
+++ b/activemodel/test/models/track_back.rb
@@ -0,0 +1,4 @@
+class Post
+  class TrackBack
+  end
+end
\ No newline at end of file