“Research shows that all blue-eyed people may be related”
At least, they may share the same distant ancestor. After studying the DNA of blue-eyed individuals from Scandinavia, Turkey, Jordan, and India, Danish researchers found that they all had identical gene sequences for eye color.
They believe this trait comes from a single individual, called the "founder," whose genes mutated between 6,000 and 10,000 years ago. Before that, everyone had varying shades of brown eyes.