Family name Ruamjaroenchai (Ruamjaroenchai 
) , in all the world, is a very rare surname. The last name Ruamjaroenchai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ruamjaroenchai | Thailand |
Chalairat, Natthaphat, and Pattanapong