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Last name Antoniu (Antonius , Antoniu , Αντόνιο ) , in the world, is a common cognomen. The cognomen Antoniu is habitual in Suriname, where it is quite a common surname, Namibia, and Romania. Measured by absolute frequency, it is the most numerous in Indonesia, Romania, and Namibia. More frequently, Antoniu is the forename as well as the last name.