I'm not sure what all information you've gotten from this already, considering how long it's been since you've first posted this, but Henry Mancini was my third cousin. When the Mancini's came over from Italy, the name was split through linguistic problems into Mancini, Mangini, and Mangino. My grandfather's last name got switched to Mangino, but, generally here in America, if you can find anyone with any one of those three variations for a last name somewhere in their family history, they'll be related in some way, shape, or form.
My grandfather's name was Michael Mangino. I'm not sure if that'll help you much, since I only know that they were cousins. He died in December of 2008 and I have no other family who would definitely know much more on the subject.