Probably from quwts in the original sense of cutting off; curtailment; Koa, a region of Bab. -- Koa.
see HEBREW quwts
H6970. Qoa
קוֺעַ proper name, of a people named with Babylonian, Chaldean, Assyrian, וְק וְ)שׁוֺעַ ׳(מְּקוֺד Ezekiel 23:23 Šô±a and †ô±a; identification by DlPa 235 with Assyrian Sutû, Kutû (abbreviated Su (? see שׁוֺעַ) and [by inference] Ku), east of Tigris, on border of Elam and Media; compare COT23:23 DrHast. iii, KOA; but קוֺעַ = Kutû now doubted by WklAltor, Forsch. ii. 2 (1899), 54.