Surname Loayza Castro (Loayza Castro 
) , globally, is a very rare last name. The cognomen Loayza Castro is habitual in Latin America and the Caribbean, particularly Bolivia, where it is a rare surname, Ecuador, where it is a very rare surname, and Chile.
| VARIANT | COUNTRY |
|---|---|
| Loayza Castro | Chile, Bolivia, Peru, Ecuador |
Leonel, and Janeth Maria