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Last name Orchan (Орхан , Orchan , اورخان ) , around the globe, is a rare cognomen. The cognomen Orchan is habitual in Greece, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Armenia. Measured by absolute frequency, it is commonest in Greece, Russia, and Bulgaria. More frequently, Orchan is the forename as well as the last name.