I knew Germany had some naming laws, so I looked up a bit more about it:
https://blogs.loc.gov/law/2017/08/naming-laws-in-germany/
Apparently things are somewhat lax in practice.
From the article, names that have been permitted in Germany:
Emilie-Extra
Christiansdottir
KiranDjehad
Fanta
Galaxina
Pumuckl
Emma TigerCosma-Shiva
Names that have been denied:
Schmitz
Borussia
Pfefferminze
Verleihnix
StoneLord
Möwe