"Langseth" and "Langsethagen" are the original names of the farm, which is near Lillehammer, Norway. Old census records identify the parish as Fåberg, but Lillehammer has become a much bigger town than the village of present-day Fåberg.

I believe that "Alfsonhaugen" was probably originally part of Langsethagen farm, because it is next door to Langsethagen.

My grandfather Christian Mathiasen (also spelled Kresten and Krestian) was the son of Matheas Krestensen. He used the surname Langsethagen before becoming Chris M. Hagen after he immigrated to the U.S. in 1910. However, his brother Olaf immigrated under the name Olaf M. Alfsonhaugen in 1927. Olaf used the name Hagen while he lived in the U.S. and Canada, and continued to use Hagen when he returned to Norway after he retired. Their sister Magda, also used the name Hagen after her immigration in 1903, before she married Nils Lee. The youngest brother in the family, Magnus, who remained in Norway on Alfsonhaugen farm, used the surname Alfsonhaugen.

There are many unrelated 'Hagens' in Wisconsin because most are derived from shortened versions of various farm names. When I was a child in Black River Falls, I thought that the name 'Hagen' was as common as Smith or Jones and I was later surprised to find out that it is relatively uncommon in the rest of the U.S., except in Wisconsin, Minnesota and the Dakotas.