Namesakes
Fictional Characters from Television:
2 characters
Jess Day 2011 New Girl 
Misty Day 2013 American Horror Story: Coven
Hall-of-Famers:
1 baseball, 1 ice hockey
(ice hockey) Clarence "Hap" Day 1961
(baseball) Leon Day 1995
Notable Actors and Entertainers:
7 actors
Marceline Day 1908-2000
Laraine Day 1920-2007
Doris Day 1922-2019
Lynda Day George 1944-
Daniel Day-Lewis 1957-
Charlie Day 1976-
Andra Day 1984-
Notable Athletes:
1 ice hockey
(ice hockey) Clarence "Hap" Day 1901-1990
Notable Musicians:
3 singers
Doris Day 1922-2019
Howie Day 1981-
Andra Day 1984-
Notable Philosophers and Thinkers:
1 jurist
Sandra Day O'Connor 1930-2023
Olympic Medalists:
1 silver
(silver) Christine Day 2012; 2016 4x400 m relay
Oscar Award Winners:
1 actor
(actor) Daniel Day-Lewis 1990; 2008; 2013 My Left Foot; There Will Be Blood; Lincoln