Board Thread:News and Announcements/@comment-69.171.163.204-20140211230902/@comment-4010415-20140212064237

Arkan421 wrote: I hope they explain this in the future. I think Monty has said before that we have to wait until it's revealed in the show to finally know why their last names are different.

So, given that... I guess they will explain in the future. No worries!