Out of your five, I'm partial to Oz (which is often Oscar shortened). Take a moment to think of all the "nicknames" your boy could get if you give him any of these names. For instance Annie Oakley quickly springs to mind. Psoriosis (the skin rash) for Osiris, Obe Juan Canobe for Oberon, Orpheus-Dorfeus, and of course Wizard of Oz or Ozzy Osbourne if you call him Oz. Just play all the possibilities out in your mind as if you were a ten-year old school bully and think about what your boy could live with. I never dreamed that when I named my beautiful daughter Amanda, her siblings and cousins would call her A MAN-duh to the point of making her cry.