Family name Galarza Castillo (Galarza Castillo 
) , all over the world, is a very rare last name. The last name Galarza Castillo is characteristic of Latin America and the Caribbean, particularly Ecuador, where it is a rare surname, and Chile, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Galarza Castillo | Chile, Ecuador |