Cognomen Sitthiso (Sitthiso 
) , around the globe, is a rare family name. The surname Sitthiso is habitual in Laos, where it is quite a rare surname, France, where it is a very rare surname, and Thailand, where it is an extremely rare surname. In absolute terms, it is commonest in Laos, France, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Sitthiso | Thailand, Laos, France, United States |