Cognomen กรธนไพโรจน์ (กรธนไพโรจน์ 
) , in all the world, is an extremely rare last name. The family name กรธนไพโรจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| กรธนไพโรจน์ | Thailand |