Surname Касимбаев (Касимбаев 
, Kasimbaev ) , globally, is a very rare cognomen. The last name Касимбаев is habitual in Kazakhstan, where it is a rare surname, Kyrgyzstan, and Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Касимбаев | Russia, Kyrgyzstan, Kazakhstan |
| Kasimbaev | Kazakhstan |