Namesakes
Fictional Characters from Movies:
1 hero
Belle 1991 Beauty and the Beast 
Fictional Characters from Song Titles:
1 character
(character) Belle 1977 Belle
Fictional Characters from Television:
1 character
Belle Black 1965 Days of Our Lives
Hall-of-Famers:
1 basketball
(basketball) Ora Washington (middle name Belle) 2018
Hurricanes and Tropical Storms:
1 hurricane
Hurricane Belle 1976
Nobel Prize Winners:
1 medicine
(medicine) Gertrude B. Elion (middle name Belle) 1988
Notable Actors and Entertainers:
2 actors
Phoebe Cates (middle name Belle) 1963-
Camilla Belle (middle name Belle) 1986-
Notable Musicians:
2 singers
Anita O'Day (middle name Belle) 1919-2006
Belle Pérez 1976-
Notable Scientists and Inventors:
1 chemist
Gertrude B. Elion (middle name Belle) 1918-1999
Notable Writers:
1 author
Isabelle de Charrière (a.k.a. Belle) 1740-1805
Olympic Medalists:
1 gold
(gold) Belle Moore 1912 swimming - 4x100 m freestyle relay