Albert Barnes Commentary 2 Samuel 23:11

"And after him was Shammah the son of Agee a Hararite. And the Philistines were gathered together into a troop, where was a plot of ground full of lentils; and the people fled from the Philistines." — 2 Samuel 23:11 (ASV)

Hararite - Interpreted to mean “mountaineer,” one from the hill country of Judah or Ephraim.