Namesakes
Emmy Award Winners:
3 actors
(actor) Donald O'Connor 1954 Colgate Comedy Hour 
(actor) Carroll O'Connor 1972; 1977; 1978; 1979; 1989 All in the Family; In the Heat of the Night
(actor) Josh O'Connor 2021 The Crown
Fictional Characters from Song Titles:
1 character
(character) Erin O'Connor 2008 Erin O'Connor
Fictional Characters from Television:
2 characters
Ruth Fisher (a.k.a. O'Connor) 2001 Six Feet Under
Sarah O'Connor 2001 Six Feet Under
Grammy Award Winners:
1 song of the year
(song of the year) Ella "Lorde" Yelich-O'Connor 2014 Royals
Hall-of-Famers:
1 ice hockey
(ice hockey) Herbert "Buddy" O'Connor 1988
Most Valuable Players:
1 winner
Herbert "Buddy" O'Connor 1948 ice hockey
Notable Actors and Entertainers:
5 actors
Una O'Connor 1880-1959
Carroll O'Connor 1924-2001
Donald O'Connor 1925-2003
Frances O'Connor 1967-
Josh O'Connor 1990-
Notable Athletes:
1 ice hockey
(ice hockey) Herbert "Buddy" O'Connor 1916-1977
Notable Musicians:
2 singers
Sinéad O'Connor 1966-2023
Ella "Lorde" Yelich-O'Connor 1996-
Notable Philosophers and Thinkers:
1 jurist
Sandra Day O'Connor 1930-2023
Olympic Medalists:
1 bronze, 1 gold/bronze, 1 silver
(gold/bronze) Wally O'Connor 1924; 1932 swimming - 4x200 m freestyle relay; water polo
(silver) Mary Anne O'Connor 1976 basketball
(bronze) Cián O'Connor 2012 equestrian
Pulitzer Award Winners:
1 literature
(literature) Edwin O'Connor 1962 The Edge of Sadness