Cognomen Гачаев (Гачаев 
, Gachayev 
, Gachaev) , throughout the world, is a rare surname. The cognomen Гачаев is characteristic of Azerbaijan, where it is quite a rare surname, Estonia, where it is a rare surname, and Russia, where it is a very rare surname. In absolute terms, it most frequently occurs in Azerbaijan, Russia, and Kazakhstan. Much less frequently, Гачаев is the forename as well as the last name.