#36 Our Emerald Isle:County O'-Irish O' Names
From a list of Irish Family Names in Ireland that begin with O'
O'Brien O'Byrne O'Carroll O'Casey O'Cullane (Collins) O'Dea
O'Donnell O'Donoghue O'Dowd O'Dwyer O'Farrell O'Flarerty
O'Grady O'Hara O'Halloran O'Keefe O'Leary O'Loughlin
O'Mahony O'Malley O'Meara O'Neill O'Reilly O'Riordan
O'Rourke O'Shea O'Sullivan O'Toole