Most of the Barnett's in the South are descendants of two brothers, Robert and James, who migrated from Pennsylvania to Virginia. (According to Pennsylvania Genealogies-Chiefly Scotch and Irish.) Their ancestors were originally from Ireland. The descendants of these two brothers have spread across the country.
My ggggrandfather, James Barnett, was born in Virginia and died in Kentucky. His father, William, was born in Pennsylvania and died in Indiana.
When and where was your William Barnett born? You can e-mail me privately at firstname.lastname@example.org