Arthur

The legendary King Arthur, who formed the Round Table (with his knights) in sixth-century England, made the name popular in the Middle Ages. Yet there’s not much agreement on what the name means—everything from “bear” (from the Celtic “artos”) to “Arnthor” (an Old German name that means “Thor, the eagle.” After languishing for almost a century, the name is making a comeback thanks to parents like actress Selma Blair, who named her son Arthur in 2011.