Surname Fainuu (Fainuu 
) , across the world, is a very rare family name. The last name Fainuu is habitual in Australia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Fainuu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fainuu | Australia, United States |