This is cool...I have Orkney ancestry...The men in the family have tested out as Haploid group R1a, which shows up in high proportion in the Orkneys
Interesting quick read article on Wikipedia about how this may signal an early group settling there:
http://en.wikipedia.org/wiki/Haplogroup_R1a_%28Y-DNA%29
Above map, 18,000 year ago.
R1a's spend the Last Glacial Maximum(18-23,000 years ago) in the Ukranian Ice Age refuge. The above map shows the direction of migration at about 12,000 years go.
There is much debate presently as to which DNA group, R1a or I1a, are the 'Viking Gene.' In my opinion, it's both.
The Orkneys where the 'jumping-off' point for the Vikings on the way to Iceland.