Cognomen Rungamornchai (Rungamornchai 
) , around the globe, is a very rare family name. The surname Rungamornchai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rungamornchai | Thailand |
Nitas, Aranvalee, and Vaninthorn