Surname Piyawatdecha (Piyawatdecha 
) , around the globe, is a very rare last name. The last name Piyawatdecha is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Piyawatdecha | Thailand |
Thanapiwat, and Thanaphiwat