Namesakes

Notable Actors and Actresses: 4 actors, 1 comedian
Edmond O'Brien   1915-1985  
Conan O'Brien   1963-  
Kieran O'Brien   1973-  
Austin O'Brien   1981-  
Dylan O'Brien   1991-  
Notable Athletes: 1 cricket, 1 football, 1 rugby
(cricket) Niall O'Brien   1981-  
(rugby) Seán O'Brien   1987-  
(football) Kitt O'Brien   1990-  
Notable Hosts and Presenters: 1 television
(television) Conan O'Brien   1963-  
Notable Musicians: 1 singer/musician
Snow (a.k.a. O'Brien)   1969-   reggae  
Olympic Medalists: 2 gold, 1 gold/bronze, 1 gold/silver, 1 silver
(silver) Edward O'Brien   1936   4x400 m relay  
(gold/silver) Parry O'Brien   1952; 1956; 1960   shot put  
(gold/bronze) Ian O'Brien   1964   swimming - 200 m breaststroke; swimming - 4x100 m medley relay  
(gold) Michael O'Brien   1984   swimming - 1500 m freestyle  
(gold) Dan O'Brien   1996   decathlon  
Oscar Award Winners: 1 actor
(actor) Edmond O'Brien   1954   The Barefoot Contessa  
Pulitzer Award Winners: 1 winner
Tim O'Brien   1991   The Things They Carried  
Saints: 1 blessed
Blessed Terence Albert O'Brien   1600-1651  
Title Characters: 1 book
(book) Glory O'Brien   2012   Glory O'Brien's History of the Future