Namesakes
Fictional Characters from Movies:
1 character
Charles Foster Kane 1941 Citizen Kane 
Nobel Prize Winners:
1 physics
(physics) Norman Foster Ramsey Jr. 1989
Notable Actors and Entertainers:
2 actors
Bill Hayes (a.k.a. Foster) 1925-2024
Barry Newman (a.k.a. Foster) 1930-2023
Notable Scientists and Inventors:
1 physicist
Norman Foster Ramsey Jr. 1915-2011
Notable Writers:
1 author
David Foster Wallace 1962-2008
Olympic Medalists:
1 bronze, 1 silver/gold
(bronze) Ephraim Graham (a.k.a. Foster) 1912 equestrian
(silver/gold) Glenn Hardin (a.k.a. Foster) 1932; 1936 400 m hurdles