Jim:
Well...that's the right part of Italy...I'd be curious to see some of thye other names you have. Here's what I can remeber off the top of my head (I'm not at home right now)
There is a "family story" that the original spelling of the name was DaVia or Da Via. Another family Story indicates that ...

Looking for information on a family from North-West Italy.
The fathers name was John Davia...his wife was Mary DeSilvestro.
Their children included Damiano and Clestie.
The immigrated to USA around 1899. They came in through New York, but by 1910 they were living in PIttsburgh. Around 1910, Damiano ...