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Guastalvino, absolutely rare, would seem Umbrian, equally rare, Gustavino would seem of the Genoese, could derive from a diminutive of the name Gustavo, but given the much more concrete presence of the surname Guastavino in the same area of Genoa and Savona, a correlation of the first surnames seems more likely with the second, which could derive from a nickname perhaps linked to the activity of host practiced by the progenitor.
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