Namesakes
Emmy Award Winners:
1 actor
(actor) John Ritter 1984 Three's Company 
Fictional Characters from Plays and Musicals:
1 character
Ilona Ritter 1963 She Loves Me
Notable Actors and Entertainers:
3 actors
Thelma Ritter 1902-1969
John Ritter 1948-2003
Krysten Ritter 1981-
Notable Philosophers and Thinkers:
1 geographer
Carl Ritter 1779-1859
Olympic Medalists:
1 gold
(gold) Louise Ritter 1988 high jump