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