Cognomen Castillo Duque (Castillo Duque 
) , throughout the world, is a very rare surname. The cognomen Castillo Duque is characteristic of Latin America and the Caribbean, particularly Ecuador, where it is a very rare surname, Chile, and Colombia.
| VARIANT | COUNTRY |
|---|---|
| Castillo Duque | Ecuador, Chile, Spain, Colombia |
Amparo, Alejandro, and Paula Nataly