probably from H6972 in the original sense of cutting off; curtailment; Koa, a region of Babylon; Koa.
Usages throughout the bible
Ezekiel 23:23
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The Babylonians, and all the Chaldeans, Pekod, and Shoa, and Koa, H6970and all the Assyrians with them: all of them desirable young men, captains and rulers, great lords and renowned, all of them riding upon horses.