Cognomen Phichayaphum (Phichayaphum 
) , all around the world, is an extremely rare surname. The last name Phichayaphum is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, Phichayaphum is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phichayaphum | Thailand |