1 Samuel 17:23 - Ellicott's Commentary On The Whole Bible

The Philistine of Gath. — There is a difficulty connected with the Philistine giant’s name, for we read in 2 Samuel 21:19 how that Goliath of Gath, the giant, “the staff of whose spear was like a weaver’s beam,” was slain by Elhanan, the son of Jaare-oregim, a Bethlehemite, after David had been made king. It is possible that Goliath was a general designation of these monstrous descendants of the ancient Anakim in Gath; but Ewald suggests that the name Goliath really only belongs to the giant slain by Elhanan, some years after the exploit of the youthful son of Jesse, and that it was transferred in error to the “champion” whom David slew (who is, moreover, generally called simply “the Philistine”) when his proper name had been lost.