Hi Lee! Welcome to WikiTree!
That Scandinavian DNA thing is definitely interesting! And probably not very accurate. The companies keep revising the comparison base, as better info becomes available. Ethnicity results from DNA are more of a parlour game than science...the real usefulness of DNA is supporting the paper trail (or not), and finding new lines, new cousins and new stories.
But meanwhile don't forget about the Danelaw, and also the Orkneys!