The parents of most babies born this year will be able to call them anything they like, but some countries are a bit fussy about that. And even if the government doesn’t object, a priest might at the christening. Back in WW II, my mother said the vicar of her little English village church flat out refused to christen a local brigadier-general’s son ‘Jeep’.
https://www.goodhousekeeping.com/life/parenting/g28035638/50-illegal-names-around-the-world/?slide=3
https://closeronline.co.uk/family/news/baby-names-rules-illegal-confirmed/
http://www.nancy.cc/2011/09/08/fighting-for-breton-baby-names-in-france/
Time Travelling With Kids 