I was at an English speaking Easter egg hunt (I live in France, the party was specifically set up to encourage kids to speak English - this is relevant). I was introduced to three kids from the same family and since I was meeting them for the first time I said "Hello, my name is Booboos, what is your name?" The first two children told me their names all fine, the third one told me a number. In the context I assumed she had misunderstood the question so I said "No, not how old you are but what is your name?", but she repeated the number. I kept going and switched to French to help him out at which point his mum intervened and clarified that the child had understood me the first time and the number was his name.
I don't know if I should tell you the number as it might make the child more identifiable but there is nothing about this number that in any way resembles a name or is used as a name in a different culture. I didn't have the guts to ask why he had been called after a number.
Judgey? Moi? Well yes but only in a lighthearted sort of way.