Namesakes
American First Ladies:
1 first lady
Pat Nixon (a.k.a. Thelma) 1969-1974 
Fictional Characters from Books:
1 character
Tib Muller (a.k.a. Thelma) 1940 Betsy-Tacy
Fictional Characters from Television:
1 character
Trixie Norton (a.k.a. Thelma) 1955 The Honeymooners
Notable Actors and Entertainers:
3 actors
Thelma Ritter 1902-1969
Thelma Todd 1906-1935
Butterfly McQueen (a.k.a. Thelma) 1911-1995
Notable Musicians:
1 singer
Thelma Houston 1946-
Notable Writers:
1 author/poet
Lucille Clifton (a.k.a. Thelma) 1936-2010
Olympic Medalists:
1 bronze, 1 gold, 1 silver
(bronze) Thelma Payne 1920 diving
(gold) Thelma Kalama 1948 swimming - 4x100 m freestyle relay
(silver) Thelma Hopkins 1956 high jump