Cognomen Castro Martillo (Castro Martillo 
) , in the entire world, is a rare surname. The surname Castro Martillo is habitual in Ecuador, where it is a rare surname, and Spain, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Castro Martillo | Spain, Ecuador |
Dennys, Monica Wendy, Santa Isabel, Ketty Maritza, and Jessica Leonor