My great grandfather was John Nachtmann. He came from Bohemia, along with many family members. There were many Nachtmann's who settled in Kansas. Some later changed the spelling of the name to Knightman, but that spelling died with them, I believe, as I can find no trace of them under that spelling. I have info if anyone is interested. Nachtmann's married Bechtels in Kansas and you will also find the name Kluber in case that helps. My Bechtels also came from Bohemia. You're welcome to email me if you need info immediately as I will probably catch it faster that way.