Namesakes
Fictional Characters from Television:
1 character
Cecil Colby 1981; 2017 Dynasty 
Hall-of-Famers:
2 ice hockey
(ice hockey) Cecil "Tiny" Thompson 1959
(ice hockey) Cecil "Babe" Dye 1970
Nobel Prize Winners:
1 economics, 1 medicine, 1 physics
(physics) Cecil Frank Powell 1950
(economics) Douglass North (middle name Cecil) 1993
(medicine) William C. Campbell (middle name Cecil) 2015
Notable Actors and Entertainers:
4 actors
Cecil Kellaway 1890-1973
John Gilbert (middle name Cecil) 1897-1936
Alwyn Kurts (middle name Cecil) 1915-2000
Freddie Bartholomew (middle name Cecil) 1924-1992
Notable Athletes:
2 ice hockey
(ice hockey) Cecil "Babe" Dye 1898-1962
(ice hockey) Cecil "Tiny" Thompson 1903-1981
Notable Businesspeople:
1 businessperson
Cecil Rhodes 1853-1902
Notable Filmmakers:
2 directors
Cecil B. DeMille 1881-1959
Tony Richardson (a.k.a. Cecil) 1928-1991
Notable Musicians:
1 musician
Cecil Taylor 1929-2018
Notable Scientists and Inventors:
1 physicist
Cecil Frank Powell 1903-1969
Olympic Medalists:
2 gold, 1 bronze, 1 bronze/gold/silver, 1 silver/gold
(bronze/gold/silver) Burton Downing (middle name Cecil) 1904 cycling - track
(silver/gold) Cecil Healy 1912 swimming - 100 m freestyle; swimming - 4x200 m freestyle relay
(gold) Cecil Griffiths 1920 4x400 m relay
(bronze) Cecil McMaster 1924 10 km walk
(gold) Carl Cain (middle name Cecil) 1956 basketball
Oscar Award Winners:
1 director
(director) Tony Richardson (a.k.a. Cecil) 1964 Tom Jones