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