Last name โรจนสุนทร (โรจนสุนทร 
, Rojanasoonthon 
) , globally, is a rare surname. The last name โรจนสุนทร is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, โรจนสุนทร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| โรจนสุนทร | Thailand |
| Rojanasoonthon | United States, Thailand |