DarkSpiral wrote...
I may not be following you. Are you talking about the fact that the Aeducan and Cousland surnames are the only two that are mentioned by NPCs? No one ever says anything to the effect of "Hey, Mage Warden, your last name is Amell right?" And the same with Brosca and Mahariel, and...ah...I can't recall the elven Mage surname.
Whatever 
What I mean is, Bioware told us back in the day that DA:O had fixed surnames for all the PCs because some the PC surnames were voiced, and the only way to make all of that word was, effectively, to fix the surname.
The idea, once DA:O went from being a multiplayer game to an SP RPG, was to have the origins (aside from Cousland and, I suppose, Aeducan) be freely name(able). But that didn't work out on the technical side, so everyone got a fixed name instead.
All this with the "as I recall" caveat.