From A Brief History of the Vikings, by Jonathan Clements.
The Icelanders’ own records mention around 400 original settlers, over fifty of whom had names that implied mixed Irish ancestry, or Celtic nicknames denoting considerable time spent outside Scandinavia. Their slaves and concubines (the mothers of many later generations) were also predominantly Irish, some of impressively noble birth. The Saga of the People of Laxardal mentions a haughty slave-girl with no appreciation of her duties, brought to Iceland already pregnant with the child of her Viking captor. She is eventually revealed as Melkorka (Mael-Curchaich?), the daughter of the Irish king Myrkjartan (Muircertach?), kidnapped at fifteen years of age. Faced with feuding women and clearly unable to control his Irish mistress, her owner eventually installed her in a homestead of her own across the river, recorded as the now-deserted site of Melkorkustadir.
Not all of the Irish who accompanied the first settlers were ill treated. The Norse matriarch Aud the Deep-Minded, who figures large in the Icelanders’ tales of the first settlers, brought many Irish slaves with her from Dublin where her late husband Olaf the White had been king. After unsuccessfully relocating to Caithness, where her son Thorsteinn the Red was killed, Aud and her entourage gave up on the harsh life on the Celtic fringe and set out for pastures new.
Aud would eventually free several of her slaves and set them up on their own – freedmen including Vifil, whose great-grandson would become the first European to be born in America, and Erp, a thrall whose mother was supposedly Myrgiol, an Irish princess sold into slavery in Britain. Although such tales often have the ring of truth, it is important to remember who was telling them – later generations of Icelanders hoping to put a polish on concubine ancestors by inventing noble backgrounds for them. Irish names certainly persisted among the Icelanders for many generations, including Njall, Kormakr, Brjan and Patrek.