Family name Koishibai (Койшибай 
, Koishibai 
) , across the world, is a very rare last name. The last name Koishibai is habitual in Armenia, where it is a rare surname, Kazakhstan, and Kyrgyzstan, where it is a very rare surname. Much more prevalently, Koishibai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Койшибай | Kazakhstan, Armenia, Kyrgyzstan, Azerbaijan, Ukraine |
| Koishibai | Russia, Kazakhstan |