Family name Mastres (Mastres 
) , in the world, is a very rare cognomen. The cognomen Mastres is habitual in the United States, where it is a very rare surname, and Venezuela, where it is an extremely rare surname. Very seldom, Mastres is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mastres | Venezuela, United States, Spain |