You're double facepalm is too small for us to appreciate the full impact of double facepalming.

If we're being serious then assuming Guess Who is a guy the three options are: Benedict, Conner, and Demetri. I don't know exactly what part of the world Guess Who hails from but given that Benedict is something of an uncommon name and he didn't say anything the last time Demetri was a major character in a previous contest I'd say the most likely option is that Guess Who's real name is Conner.