Family name Kajaev (Каяев 
, Kajaev 
, Кажаев 
) , globally, is quite a rare surname. The cognomen Kajaev is habitual in Kyrgyzstan, where it is quite a rare surname, Russia, where it is a rare surname, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Каяев | Kazakhstan, Russia, Kyrgyzstan |
| Kajaev | Georgia |
| Кажаев | Russia, Kazakhstan, Belarus |