Literally Month of the sanctuary. 𒌚 (araḫ, “month, moon”) + 𒁈 (nisānu, “sanctuary”). Compare Hebrew נִיסָן (nīsān), Arabic نَيْسَان (naysān).
𒌚𒁈 • (Araḫ Nisānu [ITI BÁRA.ZAG.GAR])