Calvetta, absolutely rare, is Roman, Calvetti is present in the area that includes Piedmont, Lombardy and Verona and lower Trentino, with a line also between Florentine and Pisan, Calvetto is specific of Piscina and Cumiana in Turin, Calvi is widespread in all of Italy, Calvo has a strain in eastern Sicily, a strain in Crotone and one very consistent in western Piedmont, may have different origins, directly or through hypocorisms, or from the Latin cognomen Calvus, or from nicknames linked to the shape of the head ( in Latin calva = skull) or physical characteristics, in many cases the origin is the origin from a toponym starting with Calvi, as there are many in Italy (Es. Calvi (BN) - (TR) - (CE) - ( PV) etc.
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