it has always been my understanding that the name Greenberry, or Green Berry was a name given to someone who was new to the larger overall "Berry" clan...people comprised of the descendants of the Gualish (Gallic-Celtic) families that arrived in this country from British territories, and also from France. This could be through adoption, or a through a family alliance. Similar in the way that people new to something are called "green horns." This name leads to the idea of the difference between a family tree on paper, and a "genetic' family tree. They are rarely the same. I have many Greenberrys in my KY family.