It's fine. No apology needed. Most people only know calogero from a bronx tale but it is a last name as well. And it's usually the last name of southern Italians. But that doesn't mean there are absolutely no northern Italians with that last name. You could probably find a lot of northern Italians with that last name if you look hard enough. That's why I don't go by last names to try and figure out where In Italy that person may be from. The last name lucchese sounds more like a northern name but tommy lucchese was sicilian so that's one example.