I do think the courts should be able to stop names involving expletives, Hitler, Devil, things with non-letter symbols etc.
I don't think they should be able to stop things like Piye which a) is an actual historical name, b) isn't the same word as plie, and c) even if it was, how many young kids know what a plie is? It would just be his name. It makes me think Pele more than plie.
Arabesque, Jete and Fouette could be nice names!