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Cognomen Duca (Duca , Дука , 杜卡 ) , around the world, is a common last name. The cognomen Duca is characteristic of Malta, where it is quite a common surname, Moldova, and Aland Islands (explore the name in all countries). In absolute terms, it most frequently occurs in Romania, Italy, and Philippines. Very seldom, Duca is the forename as well as the last name.