Cognomen Eliach (Eliach 
, Эльяш 
, אליאך ) , around the globe, is a rare surname. The last name Eliach is habitual in Israel, where it is quite a rare surname, Oman, where it is a rare surname, and Russia, where it is a very rare surname. Much less frequently, Eliach is the forename as well as the last name.