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Family name Dyar (Dyar , Диар , 戴尔 ) , all over the world, is quite a rare cognomen. The cognomen Dyar is habitual in Iraq, where it is quite a rare surname, Ireland, and the United States, where it is a rare surname. Not in comparison with a country's population, it is commonest in the United States, Iraq, and Indonesia. Likewise, Dyar is the forename as well as the last name.