Namesakes
American Presidents:
1 president
John F. Kennedy (a.k.a. Fitzgerald) 1961-1963 
Notable Actors and Entertainers:
3 actors
Gorden Kaye (a.k.a. Fitzgerald) 1941-2017
Martin Lawrence (a.k.a. Fitzgerald) 1965-
KJ Apa (a.k.a. Fitzgerald) 1997-