Family name Piyasiri (Piyasiri 
, ปิยะศิริ , ปิยศิริ ) , in the entire world, is quite a rare surname. The surname Piyasiri is characteristic of Sri Lanka, where it is quite a rare surname, Australia, where it is a very rare surname, and Indonesia. Likewise, Piyasiri is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Piyasiri | Australia, Thailand, France, Indonesia, Sri Lanka |
| ปิยะศิริ, ปิยศิริ | Thailand |