Well, Scylding is the Old English form of Old Norse Skjoldung, the term used for the descendents of Scyld or in Old Norse Skjold--namely, the line of Danish kings. As Icel pointed out, Wuffing was used of the line of East Anglian kings. Still, I have to agree with Pet to a large degree, a lot of the "surnames" (for lack of a better term here) in Germania do seem to be Gothic. It would be nice to see a bit more variety, with names derived from other Germanic peoples as well.