Cognomen Siwatt (Siwatt 
) , around the globe, is an extremely rare surname. The last name Siwatt is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more prevalently, Siwatt is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siwatt | Thailand |
Nippita, and Chaikamolwiwat