Namesakes
Eurovision Song Contest Winners:
1 winner
Jay Aston 1981 United Kingdom 
Fictional Characters from Books:
1 character
Jay Gatsby 1925 The Great Gatsby
Fictional Characters from Song Titles:
1 character
(character) Kitty Jay 2004 Kitty Jay
Fictional Characters from Television:
3 characters
Jack Ewing (a.k.a. Jay) 1978 Dallas
John Doggett (a.k.a. Jay) 1993 The X-Files
Jay Pritchett 2009 Modern Family
Hall-of-Famers:
1 baseball
(baseball) Jay Hanna "Dizzy" Dean 1953
Most Valuable Players:
1 winner
Jay Hanna "Dizzy" Dean 1934 baseball
Nobel Prize Winners:
1 chemistry, 1 physics
(chemistry) Alan J. Heeger (a.k.a. Jay) 2000
(physics) Roy J. Glauber (a.k.a. Jay) 2005
Notable Actors and Entertainers:
12 actors, 1 actor/comedian, 1 actor/presenter, 1 comedian, 1 presenter
Lionel Stander (a.k.a. Jay) 1908-1994
Jay Silverheels 1912-1980
Don Rickles (a.k.a. Jay) 1926-2017
Dack Rambo (a.k.a. Jay) 1941-1994
Richard Belzer (a.k.a. Jay) 1944-2023
Jay Thomas 1948-2017
Victor Garber (a.k.a. Jay) 1949-
Jay Leno 1950-
Jay Benedict 1951-2020
Jay O. Sanders 1953-
Jay Acovone 1955-
Verne Troyer (a.k.a. Jay) 1969-2018
Jay Tavare 1971-
Jay R. Ferguson 1974-
Jay Hernandez 1978-
Jay Baruchel 1982-
Notable Athletes:
1 baseball, 1 tennis
(baseball) Jay Hanna "Dizzy" Dean 1910-1974
(tennis) Jay Clarke 1998-
Notable Filmmakers:
1 director, 1 director/producer
Monte Hellman (a.k.a. Jay) 1929-2021
Bryan Singer (a.k.a. Jay) 1965-
Notable Musicians:
2 singers, 1 musician
"Jam Master" Jay 1965-2002
Jay-Z 1969-
Jay Chou 1979-
Notable Politicians and Statespeople:
1 politician
J. B. Pritzker (a.k.a. Jay) 1965-
Notable Scientists and Inventors:
1 physicist
Roy J. Glauber (a.k.a. Jay) 1925-2018
Notable Writers:
2 authors
John Jakes (a.k.a. Jay) 1932-2023
Jay Asher 1975-
Olympic Medalists:
4 gold, 1 bronze, 1 gold/silver, 1 silver
(gold) Jay Arnette 1960 basketball
(gold) Rex Cawley (a.k.a. Jay) 1964 400 m hurdles
(gold) Mike Burton (a.k.a. Jay) 1968; 1972 swimming - 1500 m freestyle; swimming - 400 m freestyle
(silver) Jay Silvester 1972 discus throw
(gold/silver) Jay Barrs 1988 archery - individual; archery - team
(bronze) A. J. Hinch (a.k.a. Jay) 1996 baseball
(gold) Jay Bouwmeester 2014 ice hockey
Rock and Roll Hall-of-Famers:
2 musicians
"Jam Master" Jay 2009 Run-DMC
Jay-Z 2021