Lavezzari has a lineage between Milanese and Varese and one in the Genoese, Lavezzaro is typical of the Alessandria area, Lavizzari would seem typically Milanese, Lavizzaro is practically unique and is probably due to a transcription error, should derive from toponyms like Borgolavezzaro (NO) or Pietralavezzara (GE), but it is also sustainable a thesis that links them to a trade name, that is, a craftsman who works a particular soapstone called lavezzo (dialectal term) to make pots or crockery.
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