I can throw one more curveball here that currently isn't really solved anywhere. Nameless people. This situation arises when you know you want to travel after

I can throw one more curveball here that currently isn't really solved anywhere. Nameless people. This situation arises when you know you want to travel after giving birth, and you want to book the tickets in advanced to take advantage of lower prices. Most airlines won't let you book a ticket without a name, nor do they let you edit names. The situation is also relevant in hospitals where babies are born, in Finland they literally put girl <surname> / boy <surname> into the system as the first / lastname. It's quite funny that a place literally designed to handle new humans, does not have a way to handle that.