test.rb

require 'active_support/all'
module Asdf
  def self.new(connection_name, options)
    classified_connection_name = connection_name.to_s.classify
    self.class_eval <<-EOF
      class #{classified_connection_name}
      end
      
      %w(aaa bbb ccc ddd).each do |letters|
        class #{letters.classify} < #{classified_connection_name}
        end
      end
    EOF
  end
end

Asdf.new :connection_name, name: 'Andy'

__END__

# The result of the above code is as follows:

irb(main):017:0* Asdf.new :connection_name, name: 'Andy'
SyntaxError: (eval):5: syntax error, unexpected '<', expecting :: or '[' or '.'
        class letters.classify < ConnectionName
                                ^
(eval):7: syntax error, unexpected keyword_end, expecting end-of-input
	from (irb):5:in `class_eval'
	from (irb):5:in `new'
	from (irb):17
	from /home/advorak/.rbenv/versions/2.0.0-p247/bin/irb:12:in `<main>'