可能是xšāça (OPers. form from Iranian *xšaθra, not meaning “rule”)
参见伊朗百科全书阿契美尼德王朝词条
http://www.iranicaonline.org/articles/achaemenid-dynasty

Ariaramnes用过dahyaush Parsa这个词（AmH，Old Persian），意思是波斯的土地（当时还不像后来萨珊那么强调伊朗）。

65 He put Apsû to slumber as he poured out sleep,
66 And Mummu, the counsellor, was breathless with agitation.
67 He split (Apsû’s) sinews, ripped off his crown,
68 Carried away his aura and put it on himself.
69 He bound Apsû and killed him;
70 Mummu he confined and handled roughly.
71 He set his dwelling upon Apsû,
72 And laid hold on Mummu, keeping the nose-rope in his hand.
73 After Ea had bound and slain his enemies,
74 Had achieved victory over his foes,
75 He rested quietly in his chamber,
76 He called it Apsû, whose shrines he appointed.