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Last name Troyan (Троян
, Troyan
, Троиан
) , around the world, is a common cognomen. The cognomen Troyan is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Bulgaria, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. Very seldom, Troyan is the forename as well as the last name.