Scandinavians were pretty active on the British isles in prior centuries. It's a pretty influential source of English language. "Scandinavian import" sounds very modern, like you're buying a Volvo. The import would probably be more like: Britain and Scandinavia having a common ancestral source.
True, though there of course have been many different waves of Scandinavian migrants to the British Isles over the past ~2000 years or so.
In an American context, many -son surnames likely are from modern Scandinavian migrants (within the past 200 years), particularly for anyone from the Great Lakes/Midwest regions.
The site seems to have succumbed to HN traffic so I can't read it to see if it's specifically about surnames in the British Isles.
