Namesakes
Notable Actors and Entertainers:
2 actors
Maureen O'Sullivan 1911-1998 
Moya O'Sullivan 1926-2018
Notable Athletes:
1 billiards
(billiards) Ronnie O'Sullivan 1975-
Olympic Medalists:
1 bronze, 1 silver
(bronze) Keala O'Sullivan 1968 diving
(silver) Sonia O'Sullivan 2000 5000 m