Surname Defas (Defas 
) , throughout the world, is a very rare last name. The cognomen Defas is characteristic of Ecuador, where it is a rare surname, France, where it is a very rare surname, and Chile. Measured by absolute frequency, it is the most numerous in France, Ecuador, and the United States. Very seldom, Defas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Defas | Spain, France, Malaysia, Ecuador, United States |