Across the world, Montalvo Castro (Montalvo Castro 
) is an extremely rare unknown gender first name. Predominantly, Montalvo Castro is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Montalvo Castro | Ecuador, Spain, Bolivia, Mexico, Peru |
Irene, Belinda, Lizbeth, Haydee Fany, and Nadia Cristina