How interesting indeed. Check out this story. I quote:
People with blue eyes have a single, common ancestor, according to new research. A team of scientists has tracked down a genetic mutation that leads to blue eyes. The mutation occurred between 6,000 and 10,000 years ago, so before then, there were no blue eyes. "Originally, we all had brown eyes," said Hans Eiberg from the Department of Cellular and Molecular Medicine at the University of Copenhagen.
Reminds me of the story around Genghis Khan. I quote: An international group of geneticists studying Y-chromosome data have found that nearly 8 percent of the men living in the region of the former Mongol empire carry y-chromosomes that are nearly identical. That translates to 0.5 percent of the male population in the world, or roughly 16 million descendants living today.
Mind you, even if you are not genetically descended from him, names are important as you can see from this story. Then again, given his popularity, most wanted to use Borjiin, the family name of Genghis Khan. That would have sort of negated the original purpose so its a mess.
But there you go, if you are blue eyed, then dont marry another blue eyed person otherwise your kids will turn out to be Genghis Khan :).