Hi- I'm hoping someone can help. My maternal great grandpa and 2x great grandpa both had the last name Wester. However, one of them immigrated from Norway with the surname Peterson. We have no idea why or when it was changed and and are having trouble doing research when we're not sure about what name we're supposed to be looking under. Any help appreciated. Thanks!
Great Grandpa- Hildemare Sosteness Peterson Wester D.O.B. 3/31/1892 in Moss, Norway
His dad- Harald Nickelaus Wester D.O.B. abt 1859 in Norway