Namesakes
American Presidents:
1 president
Ronald Reagan 1981-1989 
Fictional Characters from Books:
1 hero
Ronald Weasley 1997 Harry Potter and the Philosopher's Stone
Harry Potter Characters:
1 character
Ronald Weasley
Nobel Prize Winners:
1 chemistry, 1 economics, 1 medicine
(medicine) Ronald Ross 1902
(chemistry) Ronald George Wreyford Norrish 1967
(economics) Ronald Coase 1991
Notable Actors and Actresses:
6 actors
Ronald Colman 1891-1958
Ronald Reagan 1911-2004
Ken Berry (a.k.a. Ronald) 1933-2018
Ronald Pickup 1940-2021
R. Lee Ermey (a.k.a. Ronald) 1944-2018
Atticus Shaffer (a.k.a. Ronald) 1998-
Notable Athletes:
4 soccer, 2 rugby, 1 driving, 1 football
(soccer) Ron Saunders (a.k.a. Ronald) 1932-2019
(driving) Ronnie Moore (a.k.a. Ronald) 1933-2018
(soccer) Ronald Koeman 1963-
(soccer) Ronald de Boer 1970-
(rugby) Aca Ratuva (a.k.a. Ronald) 1978-
(soccer) Jonathan Walters (a.k.a. Ronald) 1983-
(rugby) Aaron Jarvis (a.k.a. Ronald) 1986-
(football) Ronald Martin 1993-
Notable Filmmakers:
1 cinematographer
Ronnie Taylor (a.k.a. Ronald) 1924-2018
Notable Politicians and Statespeople:
2 politicians
Ron Paul (a.k.a. Ronald) 1935-
Ronald Plasterk 1957-
Notable Writers:
3 authors
J. R. R. Tolkien (a.k.a. Ronald) 1892-1973
L. Ron Hubbard (a.k.a. Ronald) 1911-1986
Ronald Giphart 1965-
Olympic Medalists:
7 gold, 4 bronze, 2 bronze/gold, 2 silver, 1 silver/bronze
(gold) Ron Bontemps (a.k.a. Ronald) 1952 basketball
(gold) Ron Tomsic (a.k.a. Ronald) 1956 basketball
(gold) Ron Delany (a.k.a. Ronald) 1956 1500 m
(silver) Ron Morris (a.k.a. Ronald) 1960 pole vault
(bronze) Ronald Clarke 1964 10000 m
(gold) Ronald Lopatni 1968 water polo
(bronze/gold) Ron Freeman (a.k.a. Ronald) 1968 400 m; 4x400 m relay
(silver) Jim Ryun (a.k.a. Ronald) 1968 1500 m
(gold) Ronald Ray Smith 1968 4x100 m relay
(bronze) Ronald Mills 1968 swimming - 100 m backstroke
(bronze/gold) Herman Frazier (a.k.a. Ronald) 1976 400 m; 4x400 m relay
(bronze) Bill Forrester (a.k.a. Ronald) 1976 swimming - 200 m butterfly
(bronze) Ronald Merriott 1984 diving - springboard
(gold) Ron Brown (a.k.a. Ronald) 1984 4x100 m relay
(silver/bronze) Ronald Weigel 1988; 1992 20 km walk; 50 km walk
(gold) Rexy Mainaky (a.k.a. Ronald) 1996 badminton doubles
Oscar Award Winners:
1 actor
(actor) Ronald Colman 1947 A Double Life
Other Fictional Characters:
1 character
Ronald McDonald 1963 corporate mascot
Other Religious Leaders:
1 leader
L. Ron Hubbard (a.k.a. Ronald) 1953-1986 Church of Scientology
Saints:
1 saint
Saint Ronald 1100-1158