That's modern English though, when the word "Viking" was re-introduced as part of the general romantic revival and where much of the popular ideas of Vikings - horned helmets, dragon ships, beserkers etc - were either invented or at least highly exaggerated by modern writers and artists.

The original Old English term "þa Deniscan" (the Danes) was pretty clearly a people group as well, and they established colonies in England and France. That there is a narrower sense of "pirate" doesn't prove that there isn't a broader ethnogroup sense.