As far as I know, the Anker family came to Norway from Sweden with Erich Ancher around 1500. There is supposedly only one, genuine Anker family in Norway. Most of the family has been based in the Oslo area. There exist a lot of documentation on this family (e.g., Danmarks Adels Aarbog), so it should definitely be possible to do a thorough search. But apart from one "false" Anker family, all with this name in Norway are related. Give me a few names, and I might just be able to help you further!