Family name โกสิทธิ์ (Kosit 
, โกสิทธิ์ ) , in the entire world, is a rare surname. The surname โกสิทธิ์ is characteristic of Thailand, where it is a rare surname, Myanmar, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Thailand, Myanmar, and China. More frequently, โกสิทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kosit | Indonesia, Myanmar, India, Thailand, United States |
| โกสิทธิ์ | Thailand |