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Family name Ilyash (Ilyash , Ильяш , Иляш ) , in the world, is quite a rare cognomen. The cognomen Ilyash is characteristic of Eastern Europe, particularly Belarus, where it is quite a rare surname, Russia, where it is a rare surname, and Czechia. Not in comparison with a country's population, it is commonest in Russia, India, and Belarus. Also, Ilyash is the forename as well as the last name.