Family name ปิยะวัช (Piyawat 
, ปิยะวัช ) , globally, is a rare last name. The cognomen ปิยะวัช is habitual in Thailand, where it is a rare surname, Malaysia, where it is a very rare surname, and China, where it is an extremely rare surname. Much more frequently, ปิยะวัช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Piyawat | China, United States, Malaysia, Thailand, Australia |
| ปิยะวัช | Thailand |