Family name พจนไพบูลย์ (พจนไพบูลย์ 
) , around the world, is an extremely rare surname. The family name พจนไพบูลย์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| พจนไพบูลย์ | Thailand |