Akkadian

gapnu/gupnu - bush, (fruit)tree; vine (CAD G 44, AHw. 281, 298)

not attested before 1 millenium, meaning ‘vine’ - sparsely in NB only (probably due to WS influence)

PS
*gapn- - tree, trunk (Fronzaroli 1969b: 8, 25, 33)