Terence Albert O'Brien   (m)   1600-1651  
Saints
Edward O'Brien   (m)   1914-1976  
Olympic Medalists   1936   4x400 m relay   (silver)
Edmond O'Brien   (m)   1915-1985  
Notable Actors and Entertainers   (actor)
Oscar Award Winners   1955   The Barefoot Contessa   (actor)
Parry O'Brien   (m)   1932-2007  
Olympic Medalists   1952; 1956; 1960   shot put   (gold/silver)
Dusty Springfield   (a.k.a. O'Brien)   (f)   1939-1999  
Notable Musicians
Rock and Roll Hall-of-Famers   1999  
Anne Rice   (a.k.a. O'Brien)   (f)   1941-2021  
Notable Writers
Ian O'Brien   (m)   1947-  
Olympic Medalists   1964   swimming - 200 m breaststroke; swimming - 4x100 m medley relay   (gold/bronze)
Conan O'Brien   (m)   1963-  
Notable Actors and Entertainers   (presenter)
Michael O'Brien   (m)   1965-  
Olympic Medalists   1984   swimming - 1500 m freestyle   (gold)
Dan O'Brien   (m)   1966-  
Olympic Medalists   1996   decathlon   (gold)
Ed O'Brien   (m)   1968-  
Rock and Roll Hall-of-Famers   2019   Radiohead
Darrin "Snow" O'Brien   (m)   1969-  
Notable Musicians
Kieran O'Brien   (m)   1973-  
Notable Actors and Entertainers   (actor)
Austin O'Brien   (m)   1981-  
Notable Actors and Entertainers   (actor)
Niall O'Brien   (m)   1981-  
Notable Athletes   (cricket)
Seán O'Brien   (m)   1987-  
Notable Athletes   (rugby)
Dylan O'Brien   (m)   1991-  
Notable Actors and Entertainers   (actor)
True O'Brien   (f)   1994-  
Notable Actors and Entertainers   (actor)