In Germany the bureau where you register your child they have a book with tons of names in use around the world. But apart from that it depends on the bureaucrat handling your case. And of course you can always sue in case you don’t like their decision.

There is a German actress whose first name is Wolke (Cloud). She doesn’t know how her parents managed to get that approved. But now she is a case you can point to if you want to name your own child Wolke.