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Last name Aghajan (Aghajan , Агхайан , Агхаян ) , across the world, is a rare cognomen. The cognomen Aghajan is habitual in Armenia, where it is a rare surname, Iran, and Russia, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Russia, Iran, and the United States. Likewise, Aghajan is the forename as well as the last name.