Cognomen Койанбаев (Койанбаев 
) , globally, is a very rare last name. The family name Койанбаев is habitual in Central Asia, particularly Kazakhstan, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Койанбаев | Kazakhstan |
Koianbaev, Koyanbaev, and Koyanbayev