Lolz, my sister's name is Gretchen. But she changed it to Greta once she got older. People used to call her Gertrud.
Another idea for that is to have your wing do recon on the set first, or even ear hussle them before you open them. Try find out one of their names before you open them without them realizing it, preferably your target's name. Then make that the last one you guess and you'll get it right and they'll all be amazed.
Great shout there,try and get some inside knowledge to at least get one of them right.. Getting them al right would obviously look fake. I've done this one before, again using the same technique here and giving the target a horrific name, i think it was Betty. After she expressed that she was offended i would guess that, i then told her to let me redeem myself by performing a reading on her personality, leading into another routine i am sure you are all familiar with- The Cube. This got her on her own as the others went to get drinks whilst i was in this routine. Safe to say i got a solid number-close and a kiss