Question: The Danish House of Knýtlinga was lived in by Cnut the Great and his grandfather that had what last name?

Context paragraphs:
House of Wessex: The House of Wessex, also known as the House of Cerdic ("Cerdicingas" in Old English), refers to the family that initially ruled a kingdom in southwest England known as Wessex, from the 6th century under Cerdic of Wessex until the unification of the Kingdoms of England by Alfred the Great and his successors (Though Alfred's grandfather Egbert was the one to start consolidating West saxon domination).  Alfred and his successors would also be part of this dynasty, which would continue ruling in the main line all the way until Alfred's descendant, Ethelred the Unready, whose reign in the late 10th century and early 11th century saw a brief period of Danish occupation and following his and his son Edmund Ironside's death, kingship by the Danish Cnut the Great and his successors to 1042.  The House of Wessex then briefly regained its power for 24 years, but after the deposition of its last scion, Ethelred's great-grandson Edgar Atheling would fade into the annals of history after the death of Edgar Atheling in 1125.

Nanduri: Those with the last name Nanduri are said to hail from the village of Nanduru which is located near Bapatla and Ponnur (small towns in the Guntur District of Andhra Pradesh).  There is a village called Nanduru in East Godavari District of Andhra Pradesh as well which leads to some ambiguity.  Those with this last name could be Niyogi Brahmins or Sri Vaishnava Brahmins or they could also be from a caste other than the Brahmin caste.  One of the other known caste is Bhatraju.  For the most part, those with this last name are predominantly Brahmins.  Many have migrated from Nanduru and they have settled in various part of Andhra Pradesh.  Some are known to have settled in a village known as Lingala, which in located in the Khammam District of Andhra Pradesh.  Lingala is said to have been ruled by kings with the last name Nanduri hundreds of years ago.

Harald Bluetooth: Harald "Bluetooth" Gormsson (Old Norse: "Haraldr Gormsson" , Danish: "Harald Blåtand Gormsen" , died c. 985/86) was a king of Denmark and Norway.

Agranov: Agranov (Russian: Агранов ; masculine) or Agranova (Агранова ; feminine) is a Russian last name.  It derives from the Russian first name Gran (from the Latin word meaning "grain"), which transformed into the last name Granov.  That last name transformed into "Agranov", as the latter is easier to pronounce.

Death Note 2: The Last Name: Death Note 2: The Last Name (デスノート the Last name , Desu Nōto the Last name ) a 2006 Japanese detective supernatural psychological horror thriller film directed by Shūsuke Kaneko.  The film is the second in a series of live-action Japanese films released in 2006 based on the "Death Note" manga and anime series by Tsugumi Ohba and Takeshi Obata.  The film primarily centers on a university student named Light Yagami who decides to rid the world of evil with the help of a supernatural notebook that kills anyone whose name is written in it.  The film was produced by Nippon Television, and distributed by Warner Bros.  Pictures Japan.  It was licensed by VIZ Pictures.  A spin-off, "", was released in 2008.  A sequel, "", was released in 2016.

Edmund Ætheling: Edmund Ætheling ( ;  1015–17 – possibly 1046, certainly by 1054) was a member of the royal House of Wessex as the son of Edmund Ironside, who briefly ruled as King of England between April and November 1016.  He fought the Danish Vikings under Cnut the Great, but following the Danish victory at the Battle of Assandun in October, it was agreed that Ironside would rule Wessex, while Cnut took Mercia and probably Northumbria.  In November 1016, Ironside died and Cnut became King of all England.

Petrović: Petrović (or Petrovich) is a Slavic last and second name, found in countries with Slavic populations.  Examples of such countries are: Croatia, Serbia, Montenegro, Bosnia and Herzegovina, Slovenia, Macedonia and Russia.  This surname or last name is not tied to any nationality.  It is normal Slavic surname deriving from "Petar", which is equivalent to Peter in English.  The part "ov" designates possession: "Petrov" means "Peter's".  The suffix "ić" is a diminutive designation, or descendant designation.  So, the last name can be translated as "Peter's son", equivalent to the English last name of Peterson.

Liðsmannaflokkr: Liðsmannaflokkr ("household troop's poem") is the title of a skaldic poem in ten stanzas describing the capture of London by Cnut the Great in 1016, preserved in "Óláfs saga helga" and "Flateyjarbók" (fol.  186v), and in a shorter version in "Knýtlinga saga".

Hans M. Koch House: The Hans M. Koch House, also known as the Brickyard Residence, is a historic building located in the extreme southern portion of Kimballton, Iowa, United States.  Its significance is derived from its association with the Danish immigrant settlement of the area, and the skilled Danish craftsman who lived and worked here.  The house was the work of its owner, Hans Koch, who was also the manager of the Crystals Springs brickyard nearby.  He was a native of Slesvig, Denmark and immigrated to the United States twice.  He first settled in Michigan in 1893 before returning to Denmark four years later.  He immigrated a second time in 1908 settling in Kimballton.  He worked as a brickmaker everywhere he lived.  Built in 1908, the 1½-story brick structure is a gabled double-pile house type, which was common in the Danish settlement area of Shelby and Audubon counties in the early 20th century.  It may also be an example of a Danish house form.  It was listed on the National Register of Historic Places in 1991.

House of Knýtlinga: The Danish House of Knýtlinga (English: "House of Cnut's Descendants") was a ruling royal house in Middle Age Scandinavia and England.  Its most famous king was Cnut the Great, who gave his name to this dynasty.  Other notable members were Cnut's father Sweyn Forkbeard, grandfather Harald Bluetooth, and sons Harthacnut, Harold Harefoot, and Svein Knutsson.  It has also been called the House of Canute, the House of Denmark, the House of Gorm, or the Jelling Dynasty.

Supporting paragraphs: House of Knýtlinga Harald Bluetooth
Answer: Gormsson