Family name Uphonthian (Uphonthian 
) , worldwide, is a very rare cognomen. The last name Uphonthian is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Uphonthian | Thailand |
Kimmo, Pornnipa, Nichatorn, Vannaporn, and Yutthaphum