Akkadian

kâˀu - to spew, to vomit (CAD K 309, G 59, AHw. 284)

Var. gâˀu.
An unusual case of PS *ḳ- yielding k-/g- in Akk.

PS
*ḳy/wˀ - to vomit (SED I No. 39ᵥ; Kogan 2011: 231)