I would say that NONE need to identify you uniquely. If any engineer is using names as a unique identifier then they need to find a different career. I can't j

I would say that NONE need to identify you uniquely. If any engineer is using names as a unique identifier then they need to find a different career. I can't just call up and say "My name is John Snow, I want to withdraw $100 from my account." Even a small system will quickly run into duplicates. Names are far from unique. Systems might use name for reference purposes, but beyond that, some other unique identifier needs to be used.