Akkadian

bukānu - pestle (CAD B 308, AHw. 136)

Var. bukannu.
Probably from Sum. GIŠ.GAN(-na) “pestle, bolt, bar” (on the Sum. word see Edzard 1970:13f., 20f.; Steinkeller 1989:36f.).

PS
*bik(ʷ)ay-, *bukay- - kind of insect or worm (SED II No. 57)