Surname โรจนวรกุล (โรจนวรกุล 
, Rojanavorakul 
) , in the world, is a very rare last name. The family name โรจนวรกุล is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| โรจนวรกุล | Thailand |
| Rojanavorakul | United States, Thailand |