No - those were not family names. That was the name of the farm or sub-farm where they lived. I had family that lived on the Nerabø farms back in the 1600s -- they were never identified with that address later when they lived elsewhere.

Online study material to learn about Norwegian naming practices and patterns.

http://homepages.rootsweb.ancestry.com/~norway/na12.html
http://www.nndata.no/home/jborgos/names.htm
http://www.norwayheritage.com/norwegian-names.htm
http://www.nndata.no/home/jborgos/farms.htm