Namesakes
Grammy Award Winners:
1 record of the year
(record of the year) Olivia Newton-John 1975 I Honestly Love You 
Notable Actors and Entertainers:
3 actors
Chief John Big Tree (a.k.a. John) 1877-1967
Margaret John 1926-2011
Olivia Newton-John 1948-2022
Notable Musicians:
2 musicians, 1 singer
"Little" Willie John 1937-1968
Elton John 1947-
Olivia Newton-John 1948-2022
Olympic Medalists:
1 silver
(silver) Sabine John 1988 heptathlon
Rock and Roll Hall-of-Famers:
2 musicians
Elton John 1994
"Little" Willie John 1996