Cognomen Castillo Arauz (Castillo Arauz 
) , in all the world, is a very rare last name. The cognomen Castillo Arauz 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 Chile.
| VARIANT | COUNTRY |
|---|---|
| Castillo Arauz | Chile, Panama, Ecuador |