Cognomen ก้อยประเสริฐ (ก้อยประเสริฐ, Koiprasert 
) , across the world, is a very rare surname. The cognomen ก้อยประเสริฐ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Koiprasert | Thailand |