herman frederick schulenberg

hello! i am searching for relatives of herman
frederick schulenberg who was born in waterloo, illinois and was baptized in the
lutheran church. he settled in cape girardeau missouri with his family of which was my grandmother norma and her brother walter and sister lucille. i was told that they were related to a baron von schulenberg near heidelburg, germany by my great uncle walter.
i think i have relatives in missouri, illinois and specifically st louis area. if you could help it would be great. jeff from
cape girardeau.