My husband is Jon Bontempo and his Grandfather Jacomo came to the USA from Castelnouvo (sp) and went to Arizona and began to mine. He later moved to Detroit and had three children, Dominic, Leda, and John. We have some documents but don't know anyone he was possibly related to. We are just on a trial of a week to Ancestry.com but I hope I may have helped you some degree. We know of no one who changed their last name's spelling to Bono or Bonnie. We live in NE Arkansas and we're the only Bontempo's this area. Just as an aside---when I first married Jon, I would go to pick a prescription at my drugstore and they would call me Bonnie Tempo--you'd have to live here to totally get that but I never changed my name to Bonnie but others may have gotten tired of people calling them Bonnie and just changed their name!!!! Just joking but it took me forever to get the people here to understand that Bontempo was my last name. BJ Bontempo