Cognomen Kozubay (Козубай 
, Козубаи , Kozubay 
) , around the world, is a rare surname. The surname Kozubay is habitual in Kyrgyzstan, where it is quite a rare surname, Belarus, where it is a rare surname, and Ukraine. Measured by absolute frequency, it is commonest in Kyrgyzstan, Russia, and Belarus. Likewise, Kozubay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Козубай | Uzbekistan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Козубаи | Russia |
| Kozubay | Turkey |