Family name กาสิทธิ์ (กาสิทธิ์ 
) , across the world, is a very rare cognomen. The family name กาสิทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, กาสิทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| กาสิทธิ์ | Thailand |