Knut m. Old Icelandic knútr 'knot'.
The name of a legendary 9th C king of Denmark, an 11th C king of the North Sea Empire, an 11th C king of Denmark and England, an 11th C king of Denmark and saint, a 12th C king of Denmark, a 12th C king of Sweden, a 13th C king of Sweden, and a 13th C king of Denmark.