Family name Fanaja (Fanaja 
) , worldwide, is an extremely rare cognomen. The cognomen Fanaja is characteristic of Latin America and the Caribbean, particularly Brazil, where it is an extremely rare surname. More prevalently, Fanaja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fanaja | Brazil, India |
Raben, Sarobidy, Andriany, and Ramboasalama