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Nitri, very very rare, is typical of Lioni nell'avellinese, Nitro, almost unique, has some presence in the Alessandria and Asti areas and in Sicily, could derive from alterations of the name Franco Nithard, but the most probable thing is that they derive from a nickname based on the term nitro (saltpeter), probably intended to mean that the ancestors were extraction workers or used to prepare foods such as corned tongue or some sausages.
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