Akkadian

giršānu - (an alliaceous plant) (CAD G 96, AHw. 286)

Akk. karāšu ‘leek’ > Sum. ga-raš > Akk. giršānu (Kogan 2012a:252).

PS
*karaṯ- - leek (Fronzaroli 1969b: 6, 24, 32)