Cognomen Кусайын (Кусайын 
) , around the globe, is a very rare last name. The family name Кусайын is habitual in Kazakhstan, where it is a rare surname, and Russia, where it is an extremely rare surname. More frequently, Кусайын is the forename as well as the last name.
Касенов, Шадияров, and Калдыбеков