Well, it's not so much about 'silly', silly is fine, Musk's names would be silly, it's more about ensuring the kid won't have a guaranteed bad start to life with a crappy name like "hatesjews". On the other hand if you call a kid 'boggle', they might get teased, but might own it and be super cool and love it.

IMO only the names that would be damaging beyond a reasonable doubt should be prohibited.

Also, the nameday idea sounds cool :)