Oh wow, I didn't even think of that! That's an interesting theory. Although they debate in the books (I think I forgot to include this point) whether he actually *knows* his own true name or not; knowing yourself to be evil can be difficult. On the other hand, (sing along if you know the words) he's insane, so nothing he does has to make any logical sense.

My personal theory is that Murtagh will find out the True Name (since he's hanging out with Galbie, etc) and once Galbie's separated from the Hearts of Hearts, Murtagh will use the true name to kill Galbie and also himself - therefore fulfilling his role as Darth Vader dark destiny.