Surname Koshbay (Кошбай 
, Кошбаи , Koshbay) , all over the world, is a rare last name. The last name Koshbay is characteristic of Kyrgyzstan, where it is quite a rare surname, Kazakhstan, where it is a very rare surname, and Russia, where it is an extremely rare surname. Likewise, Koshbay is the forename as well as the last name.