Surname Sumanun (Sumanun 
) , in the entire world, is a very rare last name. The cognomen Sumanun is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Likewise, Sumanun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sumanun | India, United States, Thailand |