Family name Каинбаев (Каинбаев 
) , in all the world, is a rare surname. The family name Каинбаев is characteristic of Azerbaijan, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Kyrgyzstan, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Каинбаев | Azerbaijan, Kyrgyzstan, Kazakhstan |