etymology of Apsa'alooka

[Alan H. Hartley]

Maximilian's _Travels_ (1843, p. 174; p. 352 in v. 22 of Thwaites'
_Early Western Travels_):

"The Crows are called by the Mandans, Hahderuka, by the Manitaries,
Haideroka; they..call their own tribe Apsaruka."

Charles McKenzie's journal (1805, p. 248 in Wood & Thiessen _Early Fur
Trade_):

The [Corbeaux] Nation is in two Tribes Kegh-chy-Sa and Hey-re-ro-ka"
[and in a variant narrative, "Kegh chy ta and Hen ne no ka"]

Bob Rankin's -ro:k-a/e again. Can Randy decipher the rest?

Alan