Namesakes
Argentine Presidents:
1 president
Ramón Castillo 1942-1943 
Fictional Characters from Television:
1 character
Marty Castillo 1984 Miami Vice
Notable Artists:
1 painter
Tilsa Tsuchiya (a.k.a. Castillo) 1928-1984
Notable Athletes:
1 soccer, 1 tennis
(soccer) Kevin Mirallas (a.k.a. Castillo) 1987-
(tennis) Hans Podlipnik-Castillo 1988-
Olympic Medalists:
1 gold/silver
(gold/silver) Yulieski Gourriel (a.k.a. Castillo) 2004; 2008 baseball
Saints:
1 blessed
Blessed Elias del Socorro (a.k.a. Castillo) 1882-1928