I saw your posting and am intersted, but I don't have a solid connection. My g-g-grandfather was James F Arnett, born in Brunswick Cnty,NC in April 1812. He married Rebecca Williams Robbins and ther family them moved thru S.C. in 1850, then settled in Mobile, AL in about 1854.
I have not been able to find James' father, but I believe he had a brother named John C. Arnett.
In your research, have you found any of the descendants of the other Arnett brothers?