Surname Fierro Castillo (Fierro Castillo 
) , globally, is a very rare cognomen. The cognomen Fierro Castillo is characteristic of Latin America and the Caribbean, particularly Ecuador, where it is a rare surname, and Chile.
| VARIANT | COUNTRY |
|---|---|
| Fierro Castillo | Chile, Ecuador |
Paula Rocio, Miguel Angel, Cesar Andres, Fernando Martin, and Marianita De Jesus