David, You may want to take a look at Mississippi. Theere were a couple of Gartrell's that moved to Tennesse. Also a family from Georgia moved to Tennesse. I read about it in a legal battle over slaves. If I come across them again I'll pass them on to you.
The gartrell spelling started in Maryland and was carried to Georgia and northern Ohio. In Virginia WV, KY and sothern Ohio the spelling is GATRELL or GATTRELL. The spelling was taken with them as the headed west.