Rupert Chapman is, indeed, alive and well, and living in southeast England.
I am originally from the Hatchie Hills in northeast Mississippi, and can
trace my Chapman family back in MS to the 1840s, before which they lived in TN
and KY. My personal brick wall is Samuel Singleton Chapman, born 1820
(apparently) in what is now Graves Co, KY (then Hickman Co). I work in London, and
may be in a position to help with research in this country. That said, if so
many more serious and professional researchers than myself have failed to
get behind Giles Chapman, I wouldn't wish to suggest to anyone that I could do
any better. But I will always give it a go!
Rupert Chapman