A decidedly Campanian surname from the Caserta area, deriving from the toponym Caiazzo (CE). additions provided by Giovanni Vezzelli Caiazzo as well as the Campania surname from the toponym Caiazzo (CE), it is also a surname Lucanian, Calabrese, Sicilian and Salento; for G. Rohlfs it probably comes from the Calabrian term cajazzu 'despicable man'.
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