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Across the world, Decio (Decio , Décio , Decius ) is a common masculine first name. The first name Decio is habitual in Cabo Verde, where it is quite a common masculine name, Brazil, and Portugal, where it is quite a rare masculine name. In absolute terms, it is the most numerous in Brazil, Italy, and Angola. Much less frequently, Decio is the last name as well as the forename.
Decio is also a name for the fictitious and mythical characters: Decio , the operatic character in the opera Tito Manlio (Vivaldi) and Decio , the operatic character in the opera Ottone in Villa.
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