Surname Watthanasit (Watthanasit 
) , all over the world, is a very rare last name. The surname Watthanasit is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Watthanasit is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Watthanasit | Thailand |