Surname Kalchaev (Kalchaev, Калчаев 
) , in all the world, is a rare last name. The family name Kalchaev is habitual in Kyrgyzstan, where it is quite a common surname, Azerbaijan, where it is quite a rare surname, and Kazakhstan, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Kyrgyzstan, Azerbaijan, and Russia.