PS

*gabb(-at)- - eyebrow, eye-pit, front (SED I No. 66)

Akkadian
gabbu - brain(?) (CAD G 5, AHw. 272)
Semantic shift ‘forehead’ > ‘brain’ is possible.
Hebrew
gabbōt ˁēnayim - eyebrows (HALOT 170)
pl. fem.; lit. ‘g. of the eyes’
Hebrew
gab - eye-brow; the elevation around genitals (Jastrow 203)
pB.
Arabic
ǯubbat- - bone that forms the eye socket (BK 1 246, Lane 371)