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Hastings' Dictionary of the Bible [1]

Girzites . Acc. to   1 Samuel 27:8 , David and his men’ while living at the court of Achish king of Gath, ‘made a raid upon the Geshurites and the Girzites (RVm [Note: Revised Version margin.] Gizrites ) and the Amalekites: for those nations were the inhabitants of the land, which were of old, as thou goest to Shur, even unto the land of Egypt.’ The LXX [Note: Septuagint.] (B) is probably correct in reading only one name ‘Gizrites’ for ‘Geshurites and Girzites,’ viz. the Canaanite inhabitants of Gezer (wh. see), a town on the S.W. border of Ephraim (  Joshua 10:33;   Joshua 16:3;   Joshua 16:10 ,   Judges 1:29 ).