Definitions of knight:

• noun:   a chessman in the shape of a horse's head; can move two squares horizontally and one vertically (or vice versa)
• noun:   originally a person of noble birth trained to arms and chivalry; today in Great Britain a person honored by the sovereign for personal merit
• verb:   raise (someone) to knighthood

  Example: "The Beatles were knighted"

• name:  A surname (common: 1 in 1666 families; popularity rank in the U.S.: #155)