Family name Sithiroj (Sithiroj 
) , all over the world, is an extremely rare cognomen. The cognomen Sithiroj is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, Sithiroj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sithiroj | Thailand |