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Both Costanza and Costanzo are widespread throughout Italy, but their origin should be southern, Costanzi instead has a stock in the area between Trentino, Verona and Brescia, and another in the strip that includes Marche, Umbria and Lazio, De Costanzo is Neapolitan as the much more widespread Di Costanzo that besides being very present in Naples it is also in Barano d`Ischia, Pozzuoli, Volla, Cercola, Casamicciola Terme and Casalnuovo di Napoli, can derive from the Latin cognomen Costantius, of which we have a illustrious example with the Roman emperor Gaius Flavius Valerius Costantius, better known as Costanzo Cloro (250 - 306), but it is also possible a derivation from nicknames linked to the concept of constancy, or toponyms.