Our Italian Surnames - By Joseph Guerin Fucilla is available on Google Books. The section from which I linked it to entitled The Evolution of Italian Surnames concentrates primarily on Northern Italian Surnames. There are over 7500 surnames and sources listed throughout the 299 page book which makes it an interesting and most comprehensive read.
Book ReviewYou can read the Google book review available for more information.
The book was originally written in the late 1940's and is available on Amazon.com as well as Chapters.Indigo