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Worldwide, Amanzio (Amanzio , Amantius ) is a rare boy's first name. The forename Amanzio is habitual in Italy, where it is a rare boy's name, and Indonesia, where it is a very rare male name. Much less frequently, Amanzio is the last name as well as the forename.
Amanzio is also a name for the fictitious and mythical characters: Amanzio , the operatic character in the opera Giustino and Amanzio , the operatic character in the opera Giustino by Giovanni Legrenzi.