Surname Иляш (Ilyash 
, Iliash 
, Иляш 
) , in the world, is a rare cognomen. The surname Иляш is habitual in Czechia, where it is a rare surname, Saudi Arabia, and Kyrgyzstan, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in India, Saudi Arabia, and Russia. More frequently, Иляш is the forename as well as the last name.