LOL, I have no idea who those people are. All I know for sure is that my Scottish ancestors fought with King David in the 12th century and were given land by him. My grandmothers ancestors are Irish and I have NO idea where the Welsh and Danes come in. Weren’t they Vikings?
The funny part is that the chart showing my ancestry is confined to those areas with only a smattering of German and French from my mother’s side. The percentages there are very tiny. Her family is very small.
I found no Scottish family in Scotland after the 1700’s when they obviously immigrated to America.
The vikings were the Danish and Norse adventurers. The Welsh are the remainder of the original inhabitants or the island, the Britons though I think there is Roman blood mixed in there too.