Roger, My name is Joshua Doub and I am a decendent of Johannes Daub. When he came to North Carolina from Germany he changed his name to John Doub. He also built a church in North Carolina which still stands today known as Doub's Chapel. I am quickly finding that our family is HUGE. I am not certain of Doup, but that means very little in this family. It seems as though we have changed the spelling various times for various reasons. I hope this helps and if you have any information, I'd love to hear about it. Thanks.