Surname Riascos Castro (Riascos Castro 
) , in the entire world, is a very rare last name. The surname Riascos Castro is habitual in Latin America and the Caribbean, particularly Colombia, where it is a very rare surname, and Chile, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Riascos Castro | Chile, Colombia |
Diego, and Carlos Stiven