Namesakes
Characters in Celtic Mythology:
1 character
Cai; Kay (m) 
Fictional Characters from Plays and Musicals:
1 character
Kay 1926 Oh, Kay!
Fictional Characters from Television:
1 character
Stephanie Johnson (a.k.a. Kay) 1965 Days of Our Lives
Hall-of-Famers:
1 basketball
(basketball) Kay Yow 2002
Notable Activists and Revolutionaries:
1 activist
(activist) Haunani-Kay Trask 1949-2021
Notable Actors and Entertainers:
4 actors, 1 actor/model
Kay Francis 1905-1968
Tippi Hedren (a.k.a. Kay) 1930-
Mary Kay Place 1947-
Anna Faris (a.k.a. Kay) 1976-
Kay Panabaker 1990-
Notable Musicians:
2 singers, 1 musician
K. T. Oslin (a.k.a. Kay) 1942-2020
Suzi Quatro (a.k.a. Kay) 1950-
Deana Carter (a.k.a. Kay) 1966-
Olympic Medalists:
1 gold
(gold) Jennifer Chandler (a.k.a. Kay) 1976 diving - springboard