Soren and Amelia Wang, Wong, Vang

I have relatives on the my great grandmother's side of the family from Norway as well. There are three spellings of the last name. Wang, Wong, Vang. If anyone could give me the correct spelling that would be wonderful and also where the name originated from. Soren Andreas Wang born February 1844 Ollegaar Amalie Nilsen born September 1845 From Ofoten on the Lofoten Island was last known area in Norway where they lived. I have passenger records showing they arrived in New York on June 20, 1891. Departing from Hamburg Germany and LeHavre France. Children are Anna, Marianne, Constance, Olga, Marie, Jens also born in Norway. I also have the 1900 census records from Michigan.