Giantomasi seems to be specific of Benevento and Castelvetere in Val Fortore in particular, also Giantomaso is from Benevento, but of San Bartolomeo in Galdo and Castelnuovo Della Daunia in the nearby Foggia area, Giantommasi is practically unique and is probably due to transcription errors as well as Giantommaso, they should all derive from the fact that the progenitor was called by the compound name Giovanni (contract in Gianni) and Tommaso.
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