Surname Гилей (Gilei 
, Giley 
, Gilej 
) , in all the world, is a rare cognomen. The family name Гилей is habitual in Kazakhstan, where it is a very rare surname, Russia, and Turkey, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Russia, the United States, and Kazakhstan. Likewise, Гилей is the forename as well as the last name.