Possibly. At the time at least most of Scotland was inhabited by the Picts. Later the Orkneys (and other places) were invaded by the Vikings; also a group of Irish (the Scotti) moved on in to western Scotland, becoming the Highlanders and Islanders.
"Later the Orkneys (and other places) were invaded by the Vikings; also a group of Irish (the Scotti) moved on in to western Scotland, becoming the Highlanders and Islanders."
I had understood the Celts (Scotti) came much later than 5,000 years ago.
And I think the Nordics came later, too.
So that goes back to the picts or pre-picts; eg. what one might label the indiginous people of the British Isles.
(Before Celts, Romans, Agles, Saxons, Frisians, Jutes, Normans, Belgians, Vikings, etc.---5,000 years ago)