Last name โรจนกุลวรรธ (โรจนกุลวรรธ 
) , across the world, is an extremely rare family name. The last name โรจนกุลวรรธ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| โรจนกุลวรรธ | Thailand |