Family name Mentiroso (Mentior 
, Mentiroso 
) , in all the world, is a very rare last name. The family name Mentiroso is characteristic of Belgium, where it is a rare surname, and Brazil, where it is an extremely rare surname. Very seldom, Mentiroso is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mentior | Spain, Belgium |
| Mentiroso | Brazil |