Cognomen รัตนรุ่งโรจน์ (รัตนรุ่งโรจน์, Ratanaluerngroj, Rattanarungroj 
) , globally, is a very rare last name. The surname รัตนรุ่งโรจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rattanarungroj | Thailand |