Cognomen Ojacastro-Valenzuela (Ojacastro-Valenzuela 
) , throughout the world, is an extremely rare surname. The family name Ojacastro-Valenzuela is habitual in South-eastern Asia, particularly Philippines, where it is an extremely rare surname. Parts of the name also exists independently as a last name Ojacastro, and a last name Valenzuela.
| VARIANT | COUNTRY |
|---|---|
| Ojacastro-Valenzuela | Philippines |