Family name Chagai (חגי 
, Chagai 
, Хагай 
) , in the world, is quite a rare cognomen. The cognomen Chagai is habitual in Israel, where it is quite a rare surname, Azerbaijan, and Kazakhstan, where it is a rare surname. In absolute terms, this name is the most popular in Israel, Russia, and Ukraine. Also, Chagai is the forename as well as the last name.