I have Luedtke/ludtkes that settled in marathon County in Wisconsin. I am not sure if they might be of some relation. Carl Luedtke also I have seen that Chalres was somewhere in his name too. He came to the USA with his wife Minnie, and a couple of his children. The only one that I can remember off the top of my head is Julius August Albert Ludke/Luedtke.They were from Seligsdorf, Germany/Pommern/Pommerania/Prussia.