Namesakes
American Presidents:
1 president
Herbert Hoover (a.k.a. Clark) 1929-1933 
Fictional Characters from Books:
1 hero
Clark Kent 1938 Superman
Fictional Characters from Movies:
1 hero
Clark Kent 1978 Superman
Fictional Characters from Television:
2 characters
Clark Edison 2005 Bones
Clark Green 2005 The Office
Hall-of-Famers:
1 baseball, 1 ice hockey
(baseball) Clark Griffith 1946
(ice hockey) Clark Gillies 2002
Notable Actors and Entertainers:
4 actors, 1 presenter
Clark Gable 1901-1960
Clark Gregg 1962-
Adam Curry (a.k.a. Clark) 1964-
Clark Duke 1985-
Holliday Grainger (a.k.a. Clark) 1988-
Notable Athletes:
1 ice hockey
(ice hockey) Clark Gillies 1954-2022
Notable Explorers and Adventurers:
1 explorer
James Clark Ross 1800-1862
Notable Musicians:
2 singers
Bob Seger (a.k.a. Clark) 1945-
Kenny Loggins (a.k.a. Clark) 1948-
Notable Writers:
1 author/essayist
William Styron (a.k.a. Clark) 1925-2006
Olympic Medalists:
1 bronze, 1 silver
(silver) Robert Young (a.k.a. Clark) 1936 4x400 m relay
(bronze) Stanley Cole (a.k.a. Clark) 1972 water polo
Oscar Award Winners:
1 actor
(actor) Clark Gable 1935 It Happened One Night
Pulitzer Award Winners:
1 literature
(literature) William Styron (a.k.a. Clark) 1968 The Confessions of Nat Turner
Rock and Roll Hall-of-Famers:
1 musician
Bob Seger (a.k.a. Clark) 2004