Family name Onfong (Onfong 
) , all over the world, is a rare last name. The family name Onfong is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname, and Thailand, where it is an extremely rare surname. Also, Onfong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onfong | Laos, Thailand |