PS

*ḥa/ul(l/y)- - spinal column with thigh bones (SED I No. 114)

Semantically and phonetically not without difficulties.

Akkadian
ḫallu - crotch, region between the thighs; the hind legs of animals (CAD ḫ 45, AHw. 312)
Akk. ḫ- < *ḥ-
Hebrew
ḥulyā - limb; vertebra of the spinal column; link (Jastrow 434)
pB.
Arabic
ḥāl- - back of the horse (BK 1 518)
Arabic
maḥāl-, maḥālat- - mid back, vertebra (BK 1 520)