just looking at the 3 choices, the third one looks more natural. the DeStafani is like McDonald. The "e" could also be an "i". In any case, the best match would be Southern Italy area. Try DeStafani, DiStafani, and even split it - De Stafani, Di Stafani (that would be like Von Stevens). otherwise, you could try d'Stafani, or even cut off the "De" and go with Stafani. Try the "toe" area of Italy and the islands in the region.