My family farmed on the Rosebud Reservation in South Dakota. There is a quiet a bit of intermarriage between whites and the Lakota resulting in many tribe members having European last names, it is very common.
I don't doubt it at all. All I said was that his name didn't sound very Indian. And since they have European last names, they wouldn't be Indian last names, right?
http://en.wikipedia.org/wiki/List_of_Swedish_surnames