Nazario is absolutely rare, Nazaro, typically Pugliese, has a stock in Gallipoli in the Lecce area and in Taranto, Nazarri, very rare, it is specific to Milan, Nazzari, quite rare is Lombard, with a possible nucleus between Venice and Padua, Nazzario is almost disappeared and it would appear from southern Italy, Nazzaro would seem to be from Campania, from Naples, Benevento and Avellino in particular, with a stock also in Rome and Foggia, these surnames should all derive from the name Nazarene or from its derivative Nazario, very common in the late Middle Ages, it can be deduced from the Diplomatic Code of medieval Lombardy where in the year 1093 in one act we read: "... Tibi Nazario filio quondam ", but a derivation from toponyms such as San Nazario (SA) and (VI) is also possible.
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