Some systems even have to handle not-yet-borns. An example I have seen is that when pregnant in France, you might have to pre-register your future child for one

Some systems even have to handle not-yet-borns. An example I have seen is that when pregnant in France, you might have to pre-register your future child for one reason or another (a common one is waiting lists for childcare, but some paperwork requires it in other situations). Ours had “À naître” [to be born] as a first name, as the forms did not accept no first name.