PS
in reply to a message by Elinor
Forgot to add that Darragh is the commonest form in Ireland right now:
http://www.behindthename.com/php/search.php?terms=dara+darragh+daragh&popterm=ir&gender=both&extra=p
http://www.behindthename.com/php/search.php?terms=dara+darragh+daragh&popterm=ir&gender=both&extra=p