Surname Fonja (Fonja 
) , in all the world, is a rare family name. The family name Fonja is characteristic of Ethiopia, where it is a rare surname, Greece, and Spain, where it is a very rare surname. More frequently, Fonja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fonja | Greece, Spain, Ethiopia, India, France |