Exordium's idea is pretty logical role-play wise, though I can't see how an item would let me that happen. I really doubt that would happen.
Another a lot more reasonable thing would be like the Death Knight's ghoul. A random name of a million of them each summon. I mean, you summon one demon to do your bidding, why does it always have to be the same one? Though I wish that won't happen, I adore my minions names, I was so happy when I got my Felguard and saw that all of them have awesome names (among the strange selection of them). Kartuk (Imp), Grek'garth (Voidwalker), Darnia (Succubus), Zhaashon (Felhunter) and Shaadhun (Felguard).