Castellan is typical of the Triveneto, Castellana has a Trieste stock, one in Piacenza, one in Rome, one in Puglia and one in Sicily. Castellano has a large prevalence in the south, especially in Sicily, Puglie and Campania, while Castellani is decidedly from central north, Castellari is absolutely from Emilia and has a small stock in the Savona area, and Castellaro is Venetian, but there is also a stock in the area between the province of Alessandria and Genoa. Castellazzi has two areas of choice, the province of Bergamo and Modena, Castelletti is typical of Lombardy, Castelli is widespread throughout Italy, Castellin, very rare, is specific to the Paduan area, Castellini, present throughout Italy has more areas of origin, one of the provinces of Brescia, Verona and Vicenza, another in eastern Liguria, and another in Umbria, and there may even be one in the province of Palermo, Castello has strains scattered like a leopard spot a little all over Italy, Castellotti is Lombard from the provinces of Milan, Pavia and Lodi, Castellucci is widespread in Romagna, Tuscany, Marche and Lazio, in the Matera and Taranto areas, Castelluccio is typical of the area that includes Neapolitan, Salerno, Foggia and Potentino, with a stock also in the Palermo area, Castelluzzo has two stocks, one in the Palermo area and one in the Lecce area. All these surnames should derive from nicknames originated from the fact of living in a castle or being employed in a castle, but they can also be derived from nicknames linked to toponyms containing in their name the root Castello. additions provided by Daniele Zaia I suggest an integrative etymology of the Castellano surname, different from the more obvious one. It should, by analogy with the surname "Catalano" also very common in the South, indicate a Castilian origin of the family.
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