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Surname Didio (Didio , 迪迪奥, Дидио ) , all over the world, is quite a rare cognomen. The family name Didio is habitual in Monaco, where it is quite a common surname, Italy, where it is quite a rare surname, and Austria. Measured by absolute frequency, the name is most common in Italy, the United States, and France. Very seldom, Didio is the forename as well as the last name.