Either independently derived or potentially via Neo-Babylonian𒆳𒅗𒋛(KURka-si/Kasi/), 𒆳𒅗𒅆(KURka-ši/Kaši/), 𒆳𒅗𒀀𒊭(KURka-a-ša/Kāša/), 𒆳𒆪𒌋𒅆(KURku(-u)-ši/Kūši/), 𒆳𒆪𒌋𒋛(KURku(-u)-si/Kūsi/), 𒆪𒊓𒀀𒀀(ku-sa-a(-a)/Kusā/) which are not from Old Persian, but directly from Egyptian themselves.[1]
↑ 1.01.11.2Heinrich Otten: "Kuš, Kischiten." In: Dietz Otto Edzard (Ed.): Reallexikon der Assyriologie und Vorderasiatischen Archäologie. Volume 6, Walter de Gruyter, Berlin/New York 1980–1983, →ISBN, pp. 374–375.