Rat is typical of the Ligurian area, Piedmont which includes the provinces of Alexandria, Savona and Genoa, has strains, probably secondary, even in Roman, Neapolitan and Sicily, could derive from a name, nickname, whose use we can find in an act of 1338: "... In Burgo de Lemine, ad domum Alberti qui dicitur Rattus filius quondam Bertrami de Zeresollis de Lemine... ", but it is also possible that derives from the Germanic term Rat (council) to understand perhaps an important representative of the community, the hypothesis still more Probable is that it derives for apheresis from the toponym Borgoratto Nell'alessandrino.
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