Bosia is typically Piedmontese of Asti, with Ceppi also in Genoa, Bosio has ceppi in Piemonte, Lombardy and in the province of Verona, Of Bosio, absolutely very rare, it would look like the northmilanese zone and Varesotto, potrebbero derive from toponyms eat Bosia (CN) or Bosio (AL). (see also Boselli) I know that this name is located in Vicenza in 1600, in a little leg, read: "... Alexander Bosius filius quondam Curtii cancellarius archivii scripturarum notariorum defunctorum magnificæ civitatis Vincentiæ ...".
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