Cognomen Iarach (Яраш 
, Iarach 
) , worldwide, is a very rare surname. The family name Iarach is characteristic of Belarus, where it is a very rare surname, Kyrgyzstan, and Russia. Not in comparison with a country's population, this name is the most popular in Russia, Belarus, and Italy. More prevalently, Iarach is the forename as well as the last name.