Cognomen Гайев (Gayev 
, Гайев 
) , around the world, is a very rare family name. The last name Гайев is characteristic of Belarus, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Russia, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Belarus, India, and China. Much less frequently, Гайев is the forename as well as the last name.