The most likely link would be probably be through Calabria. My great grandfather and his parents came over from San Giovanni in Fiore, Calabria. However, I've been unable to trace back any further. In fact - all I know about my great great grandfather on that side, is that he was called "little grandpa" because he was small. I don't know his name.
Do you know anything about your adopted grandparents?
It's always cool to meet people with my family name - and even cooler if a tree-line connection can be made!!