Very rare is specific to Comasco and Milanese, derives from the word Milanese Pusterla (atrium). Additions provided by Aldo Piglia, Milan this surname most probably derives from the word Posterla or Pusterla (from the Latin posterula) in the meaning of a small gate of walls, castles and the like, for the passage exclusively pedestrian. Near the Basilica of Sant'Ambrogio in Milan there is still a massive construction, with stubby towers and
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