The John Harry from Anson Co. that you mentioned is my direct line. I believe that his father was also John Harry as there is only one Harry listed in Anson Co. in the 1790 census.
I'm working on finding the connection to the Welsh Neck folks who came down into SC from PA.
Given that Mecklenburg Co. was once part of Anson, I tend to think that surely some of those Harrys in Mecklenburg were from the group I mentioned.
In one of your posts you said that you had transcribed a letter from David (I believe that was who it was) who mentioned Jacob. Could you share some of that here on this forum? There was a Jacob Harry who married Mary Davis in 1801...I believe in Rowan County if I'm not mistaken.