If any name triggers that language filter, maybe contact support about it.
@Nigel
You can get share codes for tunes, search them among suggested tunes, filter by your name or whoever you search for. There all have share codes.
What’s in the description you are entering? I’ve had the language filter block the letter after “E” in a series of pictures that I was taking. Also had a legitimate word blocked because it was close to other words that I guess could be questionable. Otherwise, have you tried a completely different name?