Cognomen รุ่งโรจน์ดี (รุ่งโรจน์ดี, Roongrojdee 
) , throughout the world, is a very rare family name. The cognomen รุ่งโรจน์ดี is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Roongrojdee | Thailand |