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Last name Omelyan (Омелян , Омельян , Omelyan ) , across the world, is quite a rare cognomen. The family name Omelyan is habitual in Ukraine, where it is quite a rare surname, Kazakhstan, where it is a very rare surname, and Belarus. In absolute terms, it is the most numerous in Ukraine, Russia, and Kazakhstan. More prevalently, Omelyan is the forename as well as the last name.