Family name โรจนวณิช (โรจนวณิช 
, Rojanavanij 
) , around the globe, is a very rare cognomen. The last name โรจนวณิช is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| โรจนวณิช | Thailand |
| Rojanavanij | United States, Thailand |