Family name Usamanwet (Usamanwet 
) , around the world, is a very rare last name. The family name Usamanwet is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Usamanwet | Thailand |
Sutarat, Autapol, Auttapol, Nichapat, and Phattaraporn