Family name Bunthasaeng (Bunthasaeng 
) , all over the world, is an extremely rare last name. The cognomen Bunthasaeng is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Bunthasaeng | Thailand |
Sida, Triamchit, and Thanaphatphon