The meaning of Gittites in the Bible
(From International Standard Bible Encyclopedia)

git'-its (gittim, plural of gittiy): The inhabitants of Gath. They are mentioned along with the inhabitants of the other chief Philistine cities in Joshua 13:3. It would seem that numbers of them emigrated to Judah, for we find 600 of them acting as a bodyguard to David with Ittai at their head (II Samuel 15:18 ff.; II Samuel 18:2). Obed-edom, to whom David entrusted the ark when he was frustrated in bringing it into the city of David, was a Gittite (II Samuel 6:11 f.; I Chronicles 13:13). The Gittites seem to have been remarkable for their great stature (II Samuel 21:19; I Chronicles 20:5 ff.).

See more on the meaning of Gittites in the Bible:
Gittites {Hitchcock's Bible Name}

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