Cognomen Foyfon (Foyfon 
) , across the world, is an extremely rare family name. The cognomen Foyfon is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, Foyfon is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Foyfon | Thailand |
Sirikhun, Sengsong, and Chaimongkol