Last name รัตนรุ่งกิจ (รัตนรุ่งกิจ, Rattanarungkit 
) , around the world, is a very rare cognomen. The surname รัตนรุ่งกิจ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rattanarungkit | Thailand |