Last name Kozubaev (Kozubaev 
) , in the entire world, is a very rare family name. The family name Kozubaev is habitual in Kyrgyzstan, where it is a very rare surname, Kazakhstan, and Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kozubaev | Russia, United States, Kyrgyzstan, Kazakhstan |