Update: great great great grandfather James Blackburn Higdon (1824-188_)family history shows he and his brothers Decatur & Johnny and a sister Polly came to America in approx 1836 from Ireland. James B Higdon settled in northern corner of Alabama later to become Higdon, Al.
His son Thomas Walker Higdon later is the one to have the area established as Higdon and was the first postmaster there, appointed July 28, 1882.
This is all I have now. Don't know what county or Parrish they would have came from.