Cognomen Koysub (Koysub 
) , in the world, is a very rare last name. The cognomen Koysub is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Koysub | Thailand |
| supachai koysub Thai paralympic athlete, TH (b. 1901) |
|
Wanpenluk, Surachai, Cholasit, Thanadol, and Chollasitt