Many of these may prove to be will-o-wisps or mere coincidence, but one never knows...perhaps the new DNA testing process will clarify things.
Many of the Terry's out of Botetourt Co., VA have, in the first three generations, the name "Green." This may simply be the naming of a child over a war hero but it does crop up in the line of William Terry (1724-1792) through the lines of Jasper Terry and John Terry. One family line, Ruth Terry Preston and Nell Wray told me once, had heard that somewhere "back" there the name was associated with the Terry's, perhaps as a Green Terry. What made this interesting was the fact that the sister or daughter of a Col. Nathaniel Terry allegedly married a Capt. Berryman Green on 6 Nov. 1789, in Halifax Co., Va.
A letter written by William Terry (1785-1869), and dated 1857, makes mention of his having visited some cousins of the "old stock of Martin" on Pea Ridge in Benton Co., Ark. Some of those Martins can be found, according to census records , earlier in Hawkins Co., TN and before that in Virginia. All of which brings to mind that William's aunt Rachel married a John Martin in Virginia.
Another aunt, Jemina Terry married an Ezekiel Boucher and many by that name end up in Barry Co., Mo. Did they, like so many in that era, travel accompanied by extended family?