Cognomen ชัยสิทธิ์ (ชัยสิทธิ์ 
, Chaiyasit 
, Chaisit ) , globally, is quite a common last name. The family name ชัยสิทธิ์ is characteristic of Thailand, where it is quite a common surname, the United States, where it is a very rare surname, and China, where it is an extremely rare surname. Also, ชัยสิทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ชัยสิทธิ์ | Thailand |
| Chaiyasit | Australia, Thailand, Canada, United States, China |
| Chaisit | United States, Thailand |
| Chaiyasith | United States, Thailand, China |
Chaiasit, Chaisinee, Chaisith, Chaisitsanguan, Chaisitsin, Chaisitt, Chaisitti, Chaiyaasit, Chaiyasitdhi, Chaiyasitt, Chaiyasitti, and Chaiysit