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Worldwide, Sidonio (Sidonio , Sidónio , Sidonius ) is quite a rare boy's forename. The first name Sidonio is characteristic of Cabo Verde, where it is quite a common male name, Jersey, and Portugal, where it is quite a rare masculine name. Not in comparison with a country's population, the name is most common in Mexico, Portugal, and Brazil. Also, Sidonio is the last name as well as the forename.