Last name Illescas Diaz (Illescas Diaz 
) , throughout the world, is a very rare family name. The surname Illescas Diaz is habitual in Ecuador, where it is a rare surname, Spain, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Illescas Diaz | Spain, United States, Ecuador |