No, it was an identifier added to inform where he lived - his address. A common naming convention in documents. "Surname" isn't really applicable.
Online study material to learn about Norwegian naming practices and patterns.
http://homepages.rootsweb.ancestry.com/~norway/na12.htmlhttp://www.nndata.no/home/jborgos/names.htmhttp://www.norwayheritage.com/norwegian-names.htmhttp://www.nndata.no/home/jborgos/farms.htm