diff --git a/core/method/original_name_spec.rb b/core/method/original_name_spec.rb
index 8fec0e7c3..e4f55d6f0 100644
--- a/core/method/original_name_spec.rb
+++ b/core/method/original_name_spec.rb
@@ -40,4 +40,20 @@
     klass.new.method(:renamed).original_name.should == :my_method
     klass.new.method(:aliased).original_name.should == :my_method
   end
+
+  it "returns the source UnboundMethod's name for Kernel#is_a? and Kernel#kind_of?" do
+    klass = Class.new { define_method(:is_a?, ::Kernel.instance_method(:is_a?)) }
+    klass.new.method(:is_a?).original_name.should == :is_a?
+
+    klass = Class.new { define_method(:kind_of?, ::Kernel.instance_method(:kind_of?)) }
+    klass.new.method(:kind_of?).original_name.should == :kind_of?
+  end
+
+  it "preserves the source name when aliasing a define_method'd Kernel method" do
+    klass = Class.new do
+      define_method(:is_a?, ::Kernel.instance_method(:is_a?))
+      alias_method :renamed_is_a?, :is_a?
+    end
+    klass.new.method(:renamed_is_a?).original_name.should == :is_a?
+  end
 end
diff --git a/core/method/shared/to_s.rb b/core/method/shared/to_s.rb
index bfb58e689..c1e9ef8e4 100644
--- a/core/method/shared/to_s.rb
+++ b/core/method/shared/to_s.rb
@@ -78,4 +78,30 @@ def obj.bar; end
   it "shows the metaclass and the owner for a Module instance method retrieved from a class" do
     String.method(:include).inspect.should.start_with?("#<Method: #<Class:String>(Module)#include")
   end
+
+  it "shows the original name in parentheses for an aliased method" do
+    klass = Class.new do
+      def original_method; end
+      alias_method :renamed_is_a?, :original_method
+    end
+    klass.new.method(:renamed_is_a?).send(@method).should =~ /#renamed_is_a\?\(original_method\)/
+  end
+
+  it "shows the source UnboundMethod's name in parentheses for a define_method'd method" do
+    klass = Class.new { define_method(:renamed_is_a?, ::Kernel.instance_method(:is_a?)) }
+    klass.new.method(:renamed_is_a?).send(@method).should =~ /#renamed_is_a\?\(is_a\?\)/
+  end
+
+  it "does not annotate a directly looked-up Kernel method with a shared internal name" do
+    Object.new.method(:is_a?).send(@method).should_not =~ /\(kind_of\?\)/
+    Object.new.method(:kind_of?).send(@method).should_not =~ /\(is_a\?\)/
+  end
+
+  it "shows the source name when aliasing a define_method'd Kernel method" do
+    klass = Class.new do
+      define_method(:is_a?, ::Kernel.instance_method(:is_a?))
+      alias_method :renamed_is_a?, :is_a?
+    end
+    klass.new.method(:renamed_is_a?).send(@method).should =~ /#renamed_is_a\?\(is_a\?\)/
+  end
 end
diff --git a/core/unboundmethod/original_name_spec.rb b/core/unboundmethod/original_name_spec.rb
index fa9a6fcc6..358871f8a 100644
--- a/core/unboundmethod/original_name_spec.rb
+++ b/core/unboundmethod/original_name_spec.rb
@@ -40,4 +40,20 @@
     klass.instance_method(:renamed).original_name.should == :my_method
     klass.instance_method(:aliased).original_name.should == :my_method
   end
+
+  it "returns the source UnboundMethod's name for Kernel#is_a? and Kernel#kind_of?" do
+    klass = Class.new { define_method(:is_a?, ::Kernel.instance_method(:is_a?)) }
+    klass.instance_method(:is_a?).original_name.should == :is_a?
+
+    klass = Class.new { define_method(:kind_of?, ::Kernel.instance_method(:kind_of?)) }
+    klass.instance_method(:kind_of?).original_name.should == :kind_of?
+  end
+
+  it "preserves the source name when aliasing a define_method'd Kernel method" do
+    klass = Class.new do
+      define_method(:is_a?, ::Kernel.instance_method(:is_a?))
+      alias_method :renamed_is_a?, :is_a?
+    end
+    klass.instance_method(:renamed_is_a?).original_name.should == :is_a?
+  end
 end
diff --git a/core/unboundmethod/shared/to_s.rb b/core/unboundmethod/shared/to_s.rb
index 848c1eba2..dcaffeca8 100644
--- a/core/unboundmethod/shared/to_s.rb
+++ b/core/unboundmethod/shared/to_s.rb
@@ -30,4 +30,30 @@
   it "does not show the defining module if it is the same as the origin" do
     UnboundMethodSpecs::A.instance_method(:baz).send(@method).should.start_with? "#<UnboundMethod: UnboundMethodSpecs::A#baz"
   end
+
+  it "shows the original name in parentheses for an aliased method" do
+    klass = Class.new do
+      def original_method; end
+      alias_method :renamed_is_a?, :original_method
+    end
+    klass.instance_method(:renamed_is_a?).send(@method).should =~ /#renamed_is_a\?\(original_method\)/
+  end
+
+  it "shows the source UnboundMethod's name in parentheses for a define_method'd method" do
+    klass = Class.new { define_method(:renamed_is_a?, ::Kernel.instance_method(:is_a?)) }
+    klass.instance_method(:renamed_is_a?).send(@method).should =~ /#renamed_is_a\?\(is_a\?\)/
+  end
+
+  it "does not annotate a directly looked-up Kernel method with a shared internal name" do
+    Object.instance_method(:is_a?).send(@method).should_not =~ /\(kind_of\?\)/
+    Object.instance_method(:kind_of?).send(@method).should_not =~ /\(is_a\?\)/
+  end
+
+  it "shows the source name when aliasing a define_method'd Kernel method" do
+    klass = Class.new do
+      define_method(:is_a?, ::Kernel.instance_method(:is_a?))
+      alias_method :renamed_is_a?, :is_a?
+    end
+    klass.instance_method(:renamed_is_a?).send(@method).should =~ /#renamed_is_a\?\(is_a\?\)/
+  end
 end