Cognomen Utthiyung (Utthiyung 
) , around the world, is a very rare last name. The surname Utthiyung is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Utthiyung | Thailand |
Renu, Tawin, Methus, Chalisa, and Rattanawan