Namesakes
Fictional Characters from Movies:
1 hero
Ada McGrath 1993 The Piano 
Nobel Prize Winners:
1 chemistry
(chemistry) Ada Yonath 2009
Notable Actors and Actresses:
1 actress
Ada Nicodemou 1977-
Notable Athletes:
1 gymnastics
(gymnastics) Ada Lunardoni 1911-2003
Notable Philosophers and Thinkers:
1 mathematician
Ada Lovelace 1815-1852
Notable Writers:
1 author
Ada J. Graves 1870-1918
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
Title Characters:
1 film
(film) Ada 1961 Ada