Family name Castillo Villareal (Castillo Villareal 
) , in the entire world, is a very rare surname. The surname Castillo Villareal is habitual in Latin America and the Caribbean, particularly Panama, where it is a rare surname, Ecuador, where it is a very rare surname, and Argentina, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Castillo Villareal | Argentina, Panama, Ecuador |