Family name กสัยประเสริฐ (กสัยประเสริฐ 
) , throughout the world, is an extremely rare surname. The family name กสัยประเสริฐ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| กสัยประเสริฐ | Thailand |