Family name Thuwanun (Thuwanun 
) , all over the world, is an extremely rare last name. Much more prevalently, Thuwanun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thuwanun | Thailand, Tanzania |
Sujaridjan, Noppanai, Sudjaridjun, Phuttaraksa, and Phuttharaksa