This wonderfully informative site is an excellent starting point to researching your Jewish/Italian ancestry.  You'll find everything from DNA information to former surnames of Jews by provinces such as Rome, Venice and Sicily. There are also plenty of resource links to explore.  Definitely worth checking it out!

From Italian Family History:

Italy has a very important role in Jewish history and genealogy: it is located centrally on the Mediterranean sea and serves as an important crossroad and an intersection between North and South, East and West, Sephardic and Ashkenazi culture.

If your ancestors lived in or came from Europe, there are many possibilities that a branch of your family went through Italy.

New names added to the Italian Surname Database 4 Nov 2012.

Surnames include:

Amato
Arpacci
Chitè
Ciscione
Clementi
Critelli
Cipparrone
Cumbo
Fantozzi
Fatheryar
Grupposo
Mandala
Mezzanares
Olivieri
Palermo
Rosini
Tombsiano
Quarttrucci
Zarola

Plus many, many more.  To add your surnames visit the Feedback page.  Submissions should look like this:

Surname
Town
Province
Region
Your Name
Your Email

No other information is needed.