Cognomen Chaiyasit (ชัยสิทธิ์ 
, Chaiyasit 
, ไชยสิทธิ์ ) , throughout the world, is a common last name. The surname Chaiyasit is characteristic of Thailand, where it is quite a common surname, the United States, where it is an extremely rare surname, and China. Also, Chaiyasit is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ชัยสิทธิ์, ไชยสิทธิ์, ไชสิทธิ์ | Thailand |
| Chaiyasit | China, Australia, United States, Thailand, Canada |
ชัยยะสิทธิ์, ชัยสิทธิ, and ไชยะสิทธิ์
| noppadol chaiyasit researcher |
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| wilailuk chaiyasit researcher |
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| thanpol chaiyasit |
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