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