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In the entire world, Sidonius (Sidonio , Sidonius ) is quite a rare masculine given name. The forename Sidonius is habitual in Cabo Verde, where it is quite a common boy's name, Jersey, and Portugal, where it is quite a rare masculine name. Measured by absolute frequency, this name is the most popular in Mexico, Portugal, and Brazil. Likewise, Sidonius is the last name as well as the forename.