I will get out my Nash notebooks later today and see if I can answer some of your questions. Off the top of my head, John Nesbitt Nash was married to Hannah Harriett Abercrombie, Coleville's daughter. John N. Nash was raised in Anson County North Carolina by his uncle after his parents untimely death. There is a website set up by Charles called Notes on Nash, if you can't get to it by just typing that in let me know and I will locate the link in my vast Genealogy email account.
I want to say most of these Nash's were born in Greenville or Laurens county.
I will get back to you sometime today. Anything else I have that may help just let me know.