Surname ไพโรจน์พิริยะกุล (ไพโรจน์พิริยะกุล 
) , throughout the world, is a very rare cognomen. The family name ไพโรจน์พิริยะกุล is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ไพโรจน์พิริยะกุล | Thailand |