Namesakes
Canadian Prime Ministers:
1 prime minister
Joe Clark 1979-1980 
Fictional Characters from Television:
2 characters
John Clark Jr. 1993 NYPD Blue
Marissa Clark 1996 Early Edition
Hall-of-Famers:
1 football
(football) Earl "Dutch" Clark 1963
New Zealand Prime Ministers:
1 prime minister
Helen Clark 1999-2008
Notable Actors and Entertainers:
8 actors, 1 actor/comedian, 1 presenter
Wallis Clark 1882-1961
Marguerite Clark 1883-1940
Dane Clark 1912-1998
Dick Clark 1929-2012
Petula Clark 1932-
Susan Clark 1943-
Blake Clark 1946-
Candy Clark 1947-
Christie Clark 1973-
Morfydd Clark 1989-
Notable Athletes:
1 driving, 1 soccer
(driving) Jim Clark 1936-1968
(soccer) Ciaran Clark 1989-
Notable Businesspeople:
1 businessperson
William A. Clark Sr. 1839-1925
Notable Explorers and Adventurers:
1 explorer
William Clark 1770-1838
Notable Musicians:
1 singer
Petula Clark 1932-
Notable Politicians and Statespeople:
1 politician
William A. Clark Sr. 1839-1925
Notable Writers:
1 author
Mary Higgins Clark 1927-2020
Olympic Medalists:
6 silver, 3 bronze, 3 gold, 1 gold/bronze, 1 silver/gold
(gold) Ellery Harding Clark 1896 high jump; long jump
(silver) William Clark 1904 archery - team round
(silver) Arthur Clark 1924 3000 m team
(bronze) Marjorie Clark 1932 80 m hurdles
(silver) Bob Clark 1936 decathlon
(gold) Emory Clark 1964 rowing
(gold) Steve Clark 1964 swimming - 4x100 m freestyle relay; swimming - 4x100 m medley relay; swimming - 4x200 m freestyle relay
(silver) Rosalyn Bryant (a.k.a. Clark) 1976 4x400 m relay
(bronze) Barbara Clark 1976 swimming - 4x100 m freestyle relay
(bronze) Mary Ellen Clark 1992; 1996 diving - platform
(silver) Karen Clark 1996 synchronized swimming - team
(silver/gold) Jearl Miles Clark 1992; 1996; 2000 4x400 m relay
(silver) Saskia Clark 2012 sailing
(gold/bronze) Kelly Clark 2002; 2010; 2014 snowboarding
Other Notables:
1 person
Huguette Clark 1906-2011 heiress
Rock and Roll Hall-of-Famers:
4 musicians
Gene Clark 1991 The Byrds
Dave Clark 2008 The Dave Clark Five
Alan Clark 2018 Dire Straits
Steve Clark 2019 Def Leppard