Thanks for getting in touch with me. Since posting my message I have been very fortunate in finding a distant relative on the net who has traced my Adams family back to John Adams b abt 1730. There is hard evidence that he was living in Bucks Co. PA by the 1750s and that he died there. He had four sons: Henry, George, John and Jacob. I am descended from George. My John Adams's name may initially have been Adam but there is no good evidence one way or the other although more than half of the people living in Pennsylvania in the 1750s were of German extraction. Also my grandfather always said that his ancestry was German although that may have been because many of my gr grandmothers were German.
I have good data on the line down from George but I don't know much about the descendants of Henry, John and Jacob so, as you say, we may link up. If you find some evidence that we do, I would like to know about it. I'll do the same for you.