As was said in an earlier comment, that wasn't his family name. That would be "di Ser Piero", if even that could be considered a family name. In this case it di

As was said in an earlier comment, that wasn't his family name. That would be "di Ser Piero", if even that could be considered a family name. In this case it did simply mean ".. from / of Vinci". As in "Paul. You know Paul? No, not that one. I mean Paul from Bristol."