Family name Guillen Castro (Guillen Castro 
) , in all the world, is a rare surname. The last name Guillen Castro is characteristic of Latin America and the Caribbean, particularly Bolivia, where it is a rare surname, Ecuador, and the Dominican Republic.
| VARIANT | COUNTRY |
|---|---|
| Guillen Castro | Bolivia, Spain, Dominican Republic, Mexico, Ecuador |
Diego, Ayerim, Kendra, Edgar Yorvin, Juan Carlos, and Flavio Alejandro