In addition to my message of 1999 I did receive a lot of response. Last year my wife and I did visit South Dakota.
We also did receive a lot of info on mentioned names.
Some of the names, e.g. Kaptein, Brouwer, Scholten still have to many '?'s' So if anyone is able to fill in some of them I would appreciate this very much.
Always interested in more on the Dutch names!

Hennie Boertien, The Netherlands