Lazzaretti is present in Lombardy, Emilia and Romagna, Veneto and Lazio, Lazzaretto is typically Venetian from the Paduan area above all, Lazzeretti has a line in the Florentine area between Fucecchio, Vinci and Lastra A Signa, and one in Pontedera (PI), with a probably secondary lineage in Rome, Lazzeri has a Tuscan and a Trentino lineage, Lazzerini is typical of Tuscany and of Perugia, Lazzero is from Turin, Lazzeroni is from Tuscany, especially from Arezzo and Pisa, should derive from names of places such as the various Lazzaretti or Lazzeretti present in all 'Italy because of the various pests, but they could also have been originated directly or through hypocorisms by the medieval name Lazzerus, in a list of Pisan citizens of 1405 a certain Lazzerus Bacciamei de Oliveto is mentioned.
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