Cognomen Poonsastra (Poonsastra 
) , around the world, is a very rare last name. The family name Poonsastra is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Poonsastra | Thailand |
Udom, Parames, Pakpoom, Tanitha, Sootisakdi, and Kritsanapong