History of Negretti last name

Where does Negretti last name come from? Data suggests the following regions: Lombardy, Veneto.
There are 9 ancestors with Negretti last name, 2 documents are related to it.

Municipality	Events	Period
Milano, MI	1	1850
Sondalo, SO	1	1872
Treviso, TV	1	1889

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Who contributed for Negretti last name?
checco: 10 contributions
Katia19: 6 contributions
girella: 5 contributions
zeronove: 2 contributions
amministratore: 2 contributions