Cognomen สินธุ์ชัย (Sinchai 
, สินธุ์ชัย ) , all over the world, is quite a rare surname. The family name สินธุ์ชัย is habitual in Thailand, where it is quite a rare surname, Singapore, where it is a rare surname, and Australia, where it is a very rare surname. In absolute terms, it is the most numerous in Thailand, Singapore, and the United States. Likewise, สินธุ์ชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinchai | Australia, United States, Singapore, Laos, Thailand |
| สินธุ์ชัย | Thailand |