I like the idea, from an RPG point of view a surname will allow SE to expand the capabilities in-game. You could marry in game and your "husband/wife" could take your surname, you could adopt a child and they could take your surname, and if they get married and adopt, their child would have your surname, you could have a whole family tree. It's an idea can expand on with "proper" adoptions and an actual interface that shows the family tree.
That's strictly from an RPG perspective and not something I myself would do however, but having the option in an RPG does open up fantastic options on RPG servers (if SE implements them).
There is also the Linkshell variaty, I'm happily a member of Ravenmist on Shiva, so Lexxuk Ravenmist would, yeah, the sack holder would kill me :o
Of course, Surnames should not be mandatory, I'd happily stick with just Lexxuk, although for some reason Random Name does appeal..... Or Shan Toto.... Gal Ka.... Hrm.
A strange obsession, mine. But better to be addicted to smartphones and gismos than cocaine or ***, I suppose. Well, I don’t know, the result is the same after all, very little sleep, great expense and horrific mess everywhere.
-- Stephen Fry