Cognomen Fanthong (Fanthong 
, ฟันธง ) , in all the world, is a very rare last name. The cognomen Fanthong is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Fanthong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ฟันธง, Fanthong | Thailand |