Volpat seems to be unique and is probably due to a mistake of transcription of Volpato, Volpati would seem specific of the Pavese, area of Vigevano and Cassolnovo, Volpato is decidedly Veneto, especially of the area that includes the provinces of Venice, Padua, Treviso and Vicenza, Volpatti, typically Friulano, San Giorgio della Richinvelda (PN) and San Martino al Tagliamento (PN), volpact instead seems typical of Turin, Settimo Torinese in particular, should derive from dialectal nicknames often lying To indicate the son or children of the fox intended either as a surname or as a nickname or even from nicknames deriving from the dialect word Piedmontese volpatt (furbastro).
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