Cognomen Mefiant (Mefiant 
) , across the world, is a very rare last name. The family name Mefiant is habitual in France, where it is a very rare surname, and Brazil, where it is an extremely rare surname. More prevalently, Mefiant is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mefiant | Brazil, France, Democratic Republic of the Congo |