Surname Siwamit (Siwamit 
) , in all the world, is an extremely rare last name. The cognomen Siwamit is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Likewise, Siwamit is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siwamit | Thailand, India |