Last name รุ่งโรจน์ธนกุล (รุ่งโรจน์ธนกุล, Rungrojtanakul 
) , throughout the world, is an extremely rare cognomen. The cognomen รุ่งโรจน์ธนกุล is characteristic of Northern America, particularly the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rungrojtanakul | United States |