According to multiple sources, brown is the most common eye color in the world, with approximately 70-79% of the worlds population having brown eyes. This is followed by blue eyes, which are estimated to be present in 8-10% of the worlds population. Green eyes are the rarest, with only 2% of the population having them. In the United States, brown eyes are also the most common, followed by blue, hazel, and green. It is important to note that eye color is a complex trait that is determined by multiple genes and can vary widely even within families.