Cognomen Phaengthaisong (Phaengthaisong 
) , in the world, is a very rare last name. The last name Phaengthaisong is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Phaengthaisong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phaengthaisong | Thailand |