Cognomen Fongsanith (Fongsanith 
) , across the world, is an extremely rare last name. The last name Fongsanith is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Likewise, Fongsanith is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fongsanith | United States, Thailand |