[Barnacle]

... the findings are consistent with a relatively small number of Norse settlers (and descendents) migrating to Ireland during the Viking period...

I've heard that the red hair, common in Ireland, is from the Norse. But, now I have to wonder.

[squarebarb]

From some of the studies I have found on the Internet, it seems that red hair is from the indigenous, Paleolithic population.

Sorry I can't remember the names of the studies/sites.

[vladimir998]

Many Celts had red hair -- long before the Vikings showed up. Maybe the Vikings brought more blond hair to Ireland?

[GoLightly]

The Norsemen are responsible for the name Russia, from Rus meaning red. If red hair was common among the Norsemen, I doubt they'd name a different population based on it.

[truth_seeker]

"I've heard that the red hair, common in Ireland, is from the Norse. But, now I have to wonder."

The Celts who had come from the continent also had blonde and red hair.

The "Irish" language is gaellic or celtic; from those same Celts that came from the continent.

Dublin is said to have been founded by Vikings, chromosomes or no chromosomes.