The Vikings also settled some of those islands after they’d been abandoned, after earlier populations died out, or were the first settlement that has been found to date. They were happy enough to just kill all the men and take all the women. I’ve noticed that when talking with people who have also had their DNA done.
http://www.freerepublic.com/tag/skarabrae/index
Maybe but this particular place was a Pictish settlement when the Vikings arrived.