Duck is typically Sicilian, of western Sicily, of Partanna in the Trapani area and of Palermo and Geraci Siculo in the Palermo area, Anetra is almost unique and Danetra, now disappeared in Italy, are probably due to transcription errors of Duck or Anitra, which is specific to palermitano, Monreale, Altofonte and Palermo, at the origin of these surnames there should be some nicknames originated from the term duck or duck (marsh bird, but also from courtyard), perhaps to emphasize the way of walking of the progenitors.
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