A good question, because I've never heard that term before.
As far as the OP:
In my personal opinion, based on what I understand about history of the British Isles/Ireland in general, and on the research I've done over the years, I believe all of those lands to have had significant Germanic/Norse influence. The Angles/Saxons/Jutes were among the first wave of Germanic invaders who intermingled with the Native Britons/Celts/Picts already living there during about the 5th century or thereabouts. Though the heaviest influence might have been in what is now England, I can only imagine they went all over the island(s).
Then came the Vikings in about the 8-9th centuries. They also invaded those lands at numerous entry points all over. Many of the Vikings remained behind and also intermarried with the CeltoGermanics (descendants of the earlier invasions) already living there.
Then the Normans came...who were of Viking/French ancestry and THEY settled there and mixed in with the natives.
This sort of thing happened all over the Isles. Thus, it seems to me that the British Isles
in general are probably about equal parts CeltoGermanic
I include Norse under the umbrella term of Germanic...but if we wish to get technical....the British Isles are generally Breton (think Beaker peoples)/Celtic/Germanic/Norse
Just my understanding of it all. It's no wonder I'm so confused about my own ancestry....I have ancestry in all four nations of the Isles.
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