@M.A.R. oh, my keyboard got tons of hair, no idea how. It's far from my head, I have short hair, and I don't see my hair ever falling. Still, every time I clean the keyboard, I get hairballs out of it. o_O
If display names can only contain letters, digits, spaces, apostrophes or hyphens and must start with a letter or digit, then why are names like @πάνταῥεῖ 's allowed?
... at least as far as individual glyphs are concerned at least. I can't vouch for the diacritical marks combining into extant graphemes or the graphemes combining into an extant word.