Cognomen Tiwasasit (Tiwasasit 
) , across the world, is a very rare last name. The cognomen Tiwasasit is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Tiwasasit | Thailand |
Atit, Montiwa, Nichanan, Patcharin, and Anantachai