Try contacting the Museo del Cognome (Museum of the Surname). They are on Facebook and the website is http://www.museodelcognome.it/ I have used them and they are very helpful.  They are in Padula (about 2 hr drive from Sorrento) but can research all of Italy.
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Try contacting the Museo del Cognome (Museum of the Surname). They are on Facebook and the website is http://www.museodelcognome.it/ I have used them and they are very helpful.  They are in Padula (about 2 hr drive from Sorrento) but can research all of Italy.