Akkadian

ḫalbu - forest (CAD Ḫ 40, AHw. 311)

According to Hrůša 2010:218 we are probably faced with a WS loanword in Akkadian.
Cf. Ugr. ḫlb.

Areal reconstruction

*ḫalb- - mountain, hill; forest (Kogan 2015:335)

Akk.-Ugr., the origin is unknown.