What I want to see is a study linking Rh negative blood with blue eye color. Those genes have to be related somehow. Negative blood is geographically peculiar it's not evenly distributed at all, not even across the West.
And where it IS concentrated, there one remarks blue eyes.
Ireland and Brittany are obvious. Less obvious is also a subset of the Berber tribes in the Atlas Mountains of North Africa. Certain of the Berbers are swarthy with blue eyes, a rather shocking combination. The other strange place is among certain Sephardic Jews of Spain and, of course, Israel (though which direction that population flow occurred is much open to question). Blue-eyed Sephardic Jews is a strange thing...the dark-and-light business again, like the Berbers.
Anyway, I would like to see whatever cross-references there are regarding negative blood and eye color. Intuitively, when I think about the negative-blooded people I have known, the correlation is very, very high.
The Berbers are related to the Sa'ami.
O and A blood types are distributed in about equal amounts across Europe. There is a higher % of O type blood concentrated in Wales though.
My mother is Rh neg & has brown eyes, so I don't think the traits are linked. Her maternal line was Prussian & her paternal line was half Norwegian, half Swedish. The brown eyes were from the Prussian side.