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Family name Serio (Serio , Sarius , سيريو ) , worldwide, is a common last name. The last name Serio is characteristic of Italy, where it is quite a common surname, Portugal, where it is quite a rare surname, and Argentina. Measured by absolute frequency, it is commonest in Italy, the United States, and Brazil. Very seldom, Serio is the forename as well as the last name.