Surname พิรโรจน์ (พิรโรจน์ 
) , in the world, is a very rare cognomen. The last name พิรโรจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, พิรโรจน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พิรโรจน์ | Thailand |