http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1288180/
A comparison with published mtDNA lineages from European populations indicates that, whereas most founding females probably originated from Scandinavia and the British Isles.
The ancestry of the settlers is more controversial. Historical evidence suggests that not all of the settlers in Iceland originated from Scandinavia (Jones 1984). At the very least, it is believed that the settlers included a number of women and slaves from Norse settlements in the British Isles. There are numerous references in Icelandic medieval writings to the keeping of slaves, many of whom were obtained through raids on settlements in the British Isles (Jones 1984). Thus, the Icelandic founding gene pool may have received a substantial maternal contribution from the British Isles.
Wales, LOL.
Damn autocorrect! ;)