I have researched my own ancestry.
It's rather boring, nothing as interesting as yours.
Scots and Irish.
That's it!
My husband has Scottish, Irish, Italian and Norwegian great grand parents.
My paternal grandmother was Italian. She cried a lot, especially when her daughter in law, my mother died. I thank her for my love of machinery, although probably a bit second hand. The Italians are really great mechanics.
Your ancestry sounds very interesting to me. Did you know that the largest grave at Culloden was Irish? The Clan MacDonnell,. and The Clan Macdonald in Scotland. They have the same Clan Chief, The Earl of Antrim, who was and still is a raging Catholic. Look a bit deeper.
The Norwegian is par for the course since parts of Northern Scotland were probably Norwegian in days of yore.
Probably some sort of an attempt to establish an identity when you don't know enough about who you are. But the likes of you and me are all Celts, and some Sceptics as well, I do imagine. All tough old cookies, which might have something to do with why we are all still here.
Tribal? I expect so. Some of us might even be related.