Akkadian

šēru - morning (CAD Š₂ 331, AHw. 1219)

Var. fem. šērtu (CAD Š₂ 322, AHw. 1218).

PS
*šaḥ(a)r- - dawn, morning (Fronzaroli 1965a: 141, 147, 150; Kogan 2011: 196–197)