Source : Webster's Revised Unabridged Dictionary (1913)

Borderer \Bor"der*er\, n.
   One who dwells on a border, or at the extreme part or
   confines of a country, region, or tract of land; one who
   dwells near to a place or region.

         Borderers of the Caspian.                --Dyer.

Source : WordNet®

borderer
     n : an inhabitant of a border area (especially the border
         between Scotland and England)