In searching the databases you have to keep in mind that the spelling might not match what you expect - so find ways to search using wildcards or the search functions like 'starts with' or 'contains'. For the RHD databases the wildcard is not well mentioned in their instructions but it is the character %
'Hauger' probably indicates the name of a farm - either where someone resided or had previous history. Farm names are subject to spelling changes too.
Traditional Norwegian naming was patronymic. 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