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Surname Vicari (Vicari , Vicarius) , throughout the world, is a common cognomen. The surname Vicari is habitual in British Virgin Islands, where it is quite a common surname, Italy, and Switzerland, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Italy, Brazil, and the United States. Very seldom, Vicari is the forename as well as the last name.