Surname Avendaño Roa (Avendaño Roa 
) , throughout the world, is a very rare cognomen. The cognomen Avendaño Roa is habitual in Latin America and the Caribbean, particularly Chile, where it is a rare surname, and Ecuador, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Avendaño Roa | Ecuador, Chile |