Family name Luangrojanachai (Luangrojanachai 
) , worldwide, is a very rare surname. The family name Luangrojanachai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Luangrojanachai | Thailand |
Ladda, Suphakan, Punyanuch, and Phongsanan