The Danish House of Knýtlinga was lived in by Cnut the Great and his grandfather that had what last name?
House of Knýtlinga:  Other notable members were Cnut's father Sweyn Forkbeard, grandfather Harald Bluetooth, and sons Harthacnut, Harold Harefoot, and Svein Knutsson. Harald Bluetooth: Harald "Bluetooth" Gormsson (Old Norse: "Haraldr Gormsson" , Danish: "Harald Blåtand Gormsen" , died c. 985/86) was a king of Denmark and Norway.
i don't know