Namesakes
Fictional Characters from Movies:
1 character
Jack O'Neill (a.k.a. O'Neil) 1994 Stargate 
Fictional Characters from Television:
2 characters
Jack O'Neill (a.k.a. O'Neil) 1997 Stargate SG-1
Abby O'Neil 1997 Dharma & Greg
Hall-of-Famers:
1 baseball
(baseball) Buck O'Neil 2022
Notable Actors and Entertainers:
1 actor
Barbara O'Neil 1910-1980