A number of Norwegian Vikings came to settle in Scotland, particularly in the western isles and in the far north of Scotland. They became assimilated into the Scottish landscape but originally clans such as, for example, Macleod (Leod was a son of Olaf the Black, a Norse king), McIver (Ivar was a Norse personal name) and MacDonald were descended from Vikings. And a number of Norman and Flemish nobles were granted land in the Highlands in the 14th century, resulting in the establishment of, for example, the Camerons, Frasers, Chisholms, Menzies and Grants. Of course, within a few generations they were as much a part of the Highland scene as the clans who had been there for centuries before.

As for the Norwegian traditional costume materials, it's as easy as tracking them down under their name. It's easier to look for YOUR family association with the clans. For instance "SWANSON" wears the "GUNN" tartan.

Give us a list of the family names, or the specific Norwegian plaids that you're looking for, and it can be searched.

Glad to help if possible.