Cognomen Castillo Berru (Castillo Berru 
) , in the world, is a very rare last name. The last name Castillo Berru is habitual in Latin America and the Caribbean, particularly Ecuador, where it is a rare surname, Peru, where it is an extremely rare surname, and Chile. Measured by absolute frequency, this name is the most popular in Ecuador, Peru, and Spain.
| VARIANT | COUNTRY |
|---|---|
| Castillo Berru | Ecuador, Chile, Peru, Spain |