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Family name Diaconu (Diaconu , Дьякону , Диацону ) , in all the world, is a common last name. The cognomen Diaconu is habitual in Romania, where it is a common surname, Moldova, where it is quite a common surname, and Luxembourg, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Romania, Moldova, and Italy. Much less frequently, Diaconu is the forename as well as the last name.