My Great Great Grandfather

Hi, I am trying to find anything about my Great Great Grandfather Edward Johnson b Nov 1852 in Norway somewhere. I think his middle initial was A. He died in 1929 in the US, I think in Washington State. I think he immigrated and then married Gurine Brustad or Berg in 1881, not sure how he got here and I think she was here already. His father was John but not sure of his family names. I know of no siblings for him either. I would love to find out anything I can about Edward A Johnson! Does anyone know why Edward's wife Gurine's last name is listed on her daughter, Ethel's wedding certificate was Berg? I haven't seen her anywhere with Berg associated. Was there possibly another spouse of Anna Jonetta named Berg? Any ideas? I cannot figure this out and also why I do not find Ethel Edwina Johnson anywhere. I saw she was born in Ashland Wisconsin as was her brother Arther which I do not see much information on either. Edward and Gurine are listed as the parents of bothe Ethel E Johnson and Arther G Johnson but I find very little about them. I find about others in the family but not my connected people! I will be thankful for any information. Nancy