Barbara, I do not know if there were other spellings for the name Doing, but think there were some variations. Doing/Dowing/Dewing/ were some that I have seen. Someone else who was researching Doing lines thought they may have come from Vermont, but I don't have any proof of that. I do know the first place I can find my Doing line was in Bradford County, Pa. I found my John Doing and David Doing in the tax lists there, and also in the census records. The next place I found them was in Crawford County, Pa. in Cussewago Twp. They were listed in tax lists there, and John Doing is buried there in a small town called Crossingville. I have not been able to trace this line back any further than to Bradford Co., Pa. If you ever find any connection, please let me know.
Shirley