Namesakes
Eurovision Song Contest Winners:
1 winner
Dana (a.k.a. Rosemary) 1970 Ireland 
Fictional Characters from Books:
1 hero
Rosemary Woodhouse 1967 Rosemary's Baby
Fictional Characters from Movies:
1 hero
Rosemary Woodhouse 1968 Rosemary's Baby
Fictional Characters from Song Titles:
3 characters
(character) Rosemary 1969 Why Didn't Rosemary?
(character) Rosemary 1975 Lily, Rosemary and the Jack of Hearts
(character) Rosemary 2011 Dear Rosemary
Fictional Characters from Television:
1 character
Rosemary Mason 1996 Silent Witness
Notable Actors and Entertainers:
4 actors, 1 model
June Whitfield (a.k.a. Rosemary) 1925-2018
Rosemary Harris 1927-
Rosemary Clooney 1928-2002
Jean Shrimpton (a.k.a. Rosemary) 1942-
Rosemary Forsyth 1943-
Notable Musicians:
2 singers
Rosemary Clooney 1928-2002
Dana (a.k.a. Rosemary) 1951-
Notable Writers:
1 author
Rose Tremain (a.k.a. Rosemary) 1943-
Olympic Medalists:
1 silver
(silver) Rosemary Lassig 1960 swimming - 4x100 m medley relay
Other Royalty:
1 queen consort
Camilla, Queen consort of the United Kingdom (a.k.a. Rosemary) 2022- United Kingdom