Surname Phlailaharn (Phlailaharn 
) , around the globe, is a very rare family name. The cognomen Phlailaharn is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phlailaharn | Thailand |
Jansanit, Mongkolchai, and Jessadangwara