Namesakes
Fictional Characters from Television:
1 character
Olivier Castro-Staal 2001 Six Feet Under 
Notable Activists and Revolutionaries:
1 activist
(activist) Fidel Castro 1926-2016
Notable Actors and Entertainers:
1 actor
Raquel Castro 1994-
Notable Athletes:
2 soccer, 1 baseball
(soccer) Quini (a.k.a. Castro) 1949-2018
(baseball) Tony Fernández (a.k.a. Castro) 1962-2020
(soccer) Giancarlo González (a.k.a. Castro) 1988-
Notable Evildoers:
1 criminal
Ariel Castro 1960-2013
Olympic Medalists:
1 bronze, 1 gold, 1 silver
(bronze) Rafael Vidal Castro 1984 swimming - 200 m butterfly
(silver) Danel Castro 2000 baseball
(gold) Sheilla Castro 2008; 2012 volleyball
Other Leaders:
3 presidents
President Laureano Gómez (a.k.a. Castro) 1950-1953 Colombia
President Fidel Castro 1976-2008 Cuba
President Raúl Castro 2008-2018 Cuba
Portuguese Presidents and Prime Ministers:
1 prime minister/president
(prime minister/president) João do Canto e Castro 1918; 1918-1919
Saints:
1 saint
Saint Bonifacia Rodríguez y Castro 1837-1905