Family name Usnun (Usnun 
) , across the world, is a very rare last name. The surname Usnun is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname, and Philippines, where it is an extremely rare surname. Very seldom, Usnun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Usnun | India, Philippines, Thailand |