Hastings' Dictionary of the Bible
GAI . Given as a proper name in RV [Note: Revised Version.] of 1 Samuel 17:52 ‘until thou comest to Gai,’ where AV [Note: Authorized Version.] has ‘until thou comest to the valley.’ The LXX [Note: Septuagint.] , as is noted in RVm [Note: Revised Version margin.] , has Gath , and this would suit the context.
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Hastings, James. Entry for 'Gai'. Hastings' Dictionary of the Bible. https://www.studylight.org/dictionaries/eng/hdb/g/gai.html. 1909.