'Okona' bothered me a little, though that's like the tiniest complaint you could imagine about that episode and character. Just call him "O'Connor", y'know? 'Okona' looks like it should be pronounced aw-kone-ah. It's such a bad, skiffy trope to have characters called D'jawnn Psmyhythe and it's pronounced John Smith.
There's a little touch of that in TOS "Miri," where Michael J. Pollard's character is Jahn instead of John.