Namesakes
Fictional Characters from Movies:
1 character, 1 hero
Ada Gillis 1961 Ada 
Ada McGrath 1993 The Piano
Nobel Prize Winners:
1 chemistry
(chemistry) Ada Yonath 2009
Notable Actors and Entertainers:
2 actors
Vivien Merchant (a.k.a. Ada) 1929-1982
Ada Nicodemou 1977-
Notable Philosophers and Thinkers:
1 mathematician
Ada Lovelace 1815-1852
Notable Scientists and Inventors:
1 chemist
Ada Yonath 1939-
Olympic Medalists:
1 silver, 1 silver/gold
(silver) Dorothy Shirley (a.k.a. Ada) 1960 high jump
(silver/gold) Ada Kok 1964; 1968 swimming - 100 m butterfly; swimming - 4x100 m medley relay; swimming - 200 m butterfly
Saints:
1 saint
Saint Ada ?-6xx