Surname Kasyev (Касиев 
, Kasyev ) , all over the world, is a rare last name. The cognomen Kasyev is characteristic of Kyrgyzstan, where it is quite a rare surname, Azerbaijan, and Kazakhstan, where it is a rare surname. Measured by absolute frequency, it is commonest in Kyrgyzstan, Azerbaijan, and Russia. Much less frequently, Kasyev is the forename as well as the last name.