Family name Erkinbai (Эркинбай 
, Еркинбай , Еркинбаи ) , in the entire world, is quite a rare last name. The cognomen Erkinbai is habitual in Kyrgyzstan, where it is quite a common surname, Kazakhstan, where it is a very rare surname, and Russia. More prevalently, Erkinbai is the forename as well as the last name.