Arnao, very very rare, is specific to the Messina area, Arnau and Arnaudi are very rare and should be from north-western Italy, Arnaldi, very rare, it seems typical of the province of Imperia and of the Island of Elba, with a strain probably not secondary in the Vicenza area, Arnaldo, much more rare, would seem to have a Turin and a Ligurian lineage, Arnardi, extremely rare, has a stock in the Milanese, Arnaudo is typical of the Cuneo and Turin areas, as well as the less common Arneodo and the almost unique Arneudo, should all derive, directly or through dialectal modifications of various kinds, from the medieval Italian-Germanic name Arnoaldus or from the equivalent Provençal Arnaudus of which we have an example in the 12th century in Brescia: "... Hoc tempore surrexit quidam magister Arnaudus nomine, magistri Petri Abelardi discipulus, qui multa contra Romanam ecclesiam predicabat ... ".
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