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