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Cognomen Sidonius (Sidonio , Sidonius ) , in the entire world, is quite a rare last name. The cognomen Sidonius is habitual in Mozambique, where it is a rare surname, Mexico, and Angola. Not in comparison with a country's population, it is commonest in Mexico, Brazil, and Mozambique. Likewise, Sidonius is the forename as well as the last name.