Family name Sin Thai (สินไทย 
, Sin Thai 
) , all around the world, is a rare last name. The family name Sin Thai is habitual in South-eastern Asia, particularly Malaysia, where it is a rare surname, and Thailand. Likewise, Sin Thai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สินไทย | Thailand |
| Sin Thai | Malaysia |