Cognomen Kozubayev (Kozubayev 
, Козубаев 
) , in the world, is quite a rare family name. The last name Kozubayev is habitual in Kyrgyzstan, where it is quite a common surname, Azerbaijan, where it is quite a rare surname, and Russia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kozubayev | Kyrgyzstan |
| Козубаев | Kyrgyzstan, Kazakhstan, Russia, Azerbaijan |