Family name Pongjayavanij (Pongjayavanij 
) , around the world, is a very rare cognomen. The surname Pongjayavanij is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Pongjayavanij is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pongjayavanij | Thailand, China |