Orengo is specific of Liguria, of Genoa and above all of the imperiese, of Badalucco, Ventimiglia, San Remo, Castel Vittorio, Imperia, Taggia and Pigna, it could be an Italianization of the French surname Orain, which should derive from toponyms, it could also it is an ethnic form of the French city of Orange in Provence, but most likely derives instead from the medieval name Aurengus, or Orengus, a contracted form of the Germanic name Audharengus (Audharing), composed of audha (wealth, power, strength), Harija (army ) and the patronymic suffix of belonging -ing, which would therefore be for the son of the powerful army.
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