Surname Кайнбаев (Кайнбаев 
) , globally, is a rare cognomen. The surname Кайнбаев is habitual in Azerbaijan, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Russia, where it is an extremely rare surname. Much less frequently, Кайнбаев is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Кайнбаев | Azerbaijan, Kazakhstan, Russia |