Quite undiffused, it has a stump in the Veronese, in the area of Negrar in particular, and one in Viterbo, the derivation could be for the Veronese stump from the toponym fifth of Verona or also as for the Viterbo one could derive from having been the Founder of the fifth son, but the most probable and that derive from the Latin praenomen Quintus of which we have a famous example in Quintus Horatius Flaccus the famous Latin poet of the I century.
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