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Frosi is from Cremona, Frosini is typical of Pistoia and Pistoia, Frosio of Bergamo and Brescia, Frusin, almost unique is a native of Como, all derive from the medieval name Frosio, Frosinus of which we have an example in the Longobard Diplomatic Code in an act of sale of 760 where one can read: "... omnia sit in potestate eclesiae Sancti Donati, ubi Rachipert arcidiaconus rector esse uidetur, and in ecclesia Sancti Georgi, ubi Frosinus presbiter rector esse uidetur, in prefinished ...", definitely not acceptable the hypothesis of a derivation from the toponym volscio Frusinus (volscio name of the current city of Frosinone).
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