Surname Piyawonghirun (Piyawonghirun 
) , globally, is a very rare last name. The last name Piyawonghirun is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Piyawonghirun | Thailand |
Karnkawin, and Supitchaya