The Galtung family was a Norwegian noble family dating from the ennoblement of Lauritz Galtung in 1648. However, when he was ennobled, documents indicated the family descended from an older noble family, the Galte family. This led to both Hardanger families being referenced as Galtungs in history books.
A male-lineage connection between the two families has not been identified. A female-line bridging them was long proposed until that too was debunked in 1950, by professor Lars Hamre's discovery of the Torsnes' family lineage in Copenhagen archives. The lineage stated that the younger Galtungs were descendants of Sigurd Guttormsson at Torsnes, not Sigurd Gautsson Galte at Hatteberg as previously claimed.[2]
There can, as others have pointed out, only be derived an ancestry through females from these brothers of the old Galtung family.