Never a more succinct description of why it's hard to make things better.
Can. 855 Parents, sponsors, and the pastor are to take care that a name foreign to Christian sensibility is not given.
https://www.vatican.va/archive/cod-iuris-canonici/eng/docume....
And there are tons of laws that forbid abusing childs. Like you can't hit them, shake them. In the USA they perhaps have a law that you can't put them in a microwave, I dunno.
And the laws in the european countries that forbid silly names are usually not restrict your "owners rights", but to protect the kid. In Germany, I mean, over here they forbid that people called their kid "Rumpelstilzchen", the name of an imp/goblin in a very well know fairy tale. If the parents would have come through I expect that the kid would have ridiculed in school and outside quite a lot. Other kids can be cruel ... and even the odd mindless adult.
Actual names that german parents wanted for their kids, but that weren't granted: Bierstübl, Borussia, Crazy Horse, Gastritis, Grammophon, Januar, Joghurt, Kirsche, Liebknecht, McDonald, Millenium, Möhre, Pfefferminze, Pilulla, Porsche, Rosenherz, Rumpelstilzchen, Satan, Schmitz, Schnucki, Schröder, Seerose, Sputnik, Störenfried, Rasputin, Verleihnix, Waldmeister, Whisky, Woodstock
Some have outright negative connotation (Satan, Störenfried, Rumpelstilzchen), others are just extremely uncommon and thus standing out. For example, in Germany we don't name girls about other things like Melody, Crystal, Daisy, Faith, Grace, Haven, Hazel, Amber, etc. So if you name your kid after a product or a thing, e.g. Porsche, Kirsche or Joghurt, then it will draw the wrath of the other kids onto itself.
And THAT is the reason the authorities don't allow a name. It's not about unusualness alone. A lot of unusual first names were the parents could show "Esenosarumensemwonken is a first name in Nigeria" go through.
Really? With the spelling Portia it's a perfectly respectable girl's name in English, why not in German? Or are they completely unrelated? The English Portia stems from Brutus' wife.
Surely it was the name of a person long before it was the name of a thing?
Do they also forbid Mercedes?
There is a public index of forenames and surnames which I learned about when I was with my pregnant wife, and back then I was obsessively searching for my/our surname to see it increase by one when our newborn was registered and became "official".
Apparently within the whole of Finland there 22 men with the same surname as me, and 25 women. 21 of these people are in Finland and 26 are abroad but known.
Interestingly if I go to the forename search and look for people named "Steve" there are < 5 women with that name (i.e. non-zero, but the number masked for privacy reasons):
https://nimipalvelu.dvv.fi/en/forename-search?name=Steve
I'm curious about the origin there, though of course I've seen Steve -> Steffan -> Stephany, and similar translations in the past.