Wollum/Anderson, Andrew

We are looking for a "needle in a haystack"! Is there a farm in Norway by the name of "Wollum"? We are trying to locate information on ancestors of Andrew Anderson who lived in northern Iowa/southern Minnesota. He is buried at Trinity Lutheran, rural Thompson, Iowa; previously the address was rural Bricelyn, Minnesota. We believe he changed his name to Anderson from Wollum or something similar. I will keep searching but would appreciate any help.