It seems to have a stock in the Varese area and one between the Genoese and the Alexandrians, it should derive from a name of localities such as Pianezze (VC) or Pianezza (TO) or Pianezza fraction of Vilminore di Scalve (BG), a trace of this surname is found in 1200 a Cascia (PG) with Bernardino di Pianezza rector of Monteleone di Spoleto (PG).
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