Surname ปิยะรัช (Piyarat 
, ปิยะรัช , Piyaratch ) , all over the world, is a rare last name. The surname ปิยะรัช is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, Indonesia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. In absolute terms, the name is most common in Thailand, Indonesia, and China. More frequently, ปิยะรัช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Piyarat | Thailand, United States, India, Indonesia, China |
| ปิยะรัช, Piyaratch | Thailand |
สรหงษ์, ธนเกียรติ์, and บรรณสินธุ์