He is not in the 1801 census, but the census suggests that he is dead and his wife remarried. He has two children 13 and 16, so he may be gone for 13 years in 1801.
His name is listed as Halvor in christening record of daughter Sigri.
The Slidre baptism record for 15 Oct 1762 suggests a possibility that Niels Håvard Ellestad may be the father and Sigrid Knutsen may be the mother, this is circumstancial for now.
FreeFormatDate:possible, not conclusive
Jon Torgerson Jonsrud (Reien?)
LDS also has a John Torgersen Jonsrud b. 21 Feb 1757 at Slidre,Oppland, Norway of parents Targer Evenen and Ingeberg Olsen.[Film #:170471, Page #: 317, Ordinance #: 8682]
LDS reference of Knud Johnsen Johnsrud lists father spelled as JohnTorgersen. Digitalarkivet list marriage name as Jon Torgersen. Svein lists his name as Jon Torgersen Reien and notes "Gårdbruker på Midtre Vølladn i Hegge og i Jonsrud i Volbu"
Randi (Ragnhild?) Knutsdatter Alfstad
LDS reference of Knud Johnsen Johnsrud lists mother spelled as Randi Knudsen. Svein notes the name as Ragnhild Knutsdatter Alfstad.
Anen leased part of Nuland.
Anen leased part of Nuland.
Ref. Bygdebok, p. 333.