Can't help to bug in for several reasons. Vikings were Norse people who left their homes to raid, colonize, and trade. So, as mentioned earlier in the thread, those who raided were in fact vikings (and Norse), while those who stayed home kept on just being farmers, blacksmiths, bakers (and Norse).
I have heard several suggestions for the origin of the name Viking. The specific location in Norway was a new one, the most common idea is that it comes from the word "vik", meaning bay, which is where they hid their ships.
The Vikings, or Norse, attacking at Stamford Bridge were Norweigan, under Harald Hardrada.
Having said that, I would also like to see a Viking mod. Or preferably a "Danelaw" mod or something similar, where you would have Anglo-Saxons vs Vikings (mostly Danes and Norweigans). Depending on when the mod is set, you could let the Norse be raiders, have standing armies, to being rulers of all England (Cnut). A 1066 mod is not a bad idea, but the number of battles between the death of Edward the Confessor and the battle of Hastings was very limited.