define_sample.rb

class Foo
  private_class_method def self.common_method(*syms)
    syms.each do |sym|
      define_method sym do
        puts sym
      end
    end
  end
  
  common_method :murajun, :murajun1978
end

Foo.new.murajun     # => murajun
Foo.new.murajun1978 # => murajun1978