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Surname Taddeo (Taddeo , טדאו , Таддео) , worldwide, is quite a rare cognomen. The surname Taddeo is characteristic of Italy, where it is quite a rare surname, Argentina, and Uruguay. Not in comparison with a country's population, the name is most common in the United States, Italy, and Argentina. Very seldom, Taddeo is the forename as well as the last name.