I know people hate the idea of all three of world government, government IDs, and reducing people to numbers, but things would be a lot easier if we could just write on forms "I'm person number 15389247652" and let name matching be relegated to historical documents.
As you hinted, we would need a global authority recognized and trusted by everyone at least for name registration and resolution.
About government IDs and reducing people to numbers, most of the threads here are already giving them for granted. We are a number once we're in a database.
