Hi Elmer Fudd! Yes, the word Murrumbidgee is an aboriginal word meaning 'big water' - very suitable because the Murrumbidgee is a large important river. In "Yarri of Wiradjuri", John makes reference to this meaning in one of the songs:

White man fool to camp on the low ground,
Big Water come down,
White man learn the ways of the land or drown.

While writing Yarri, he had a vision of the Murrumbidgee River and its anabranch, Morley's Creek, as a personalised entity - The Mother and the Daughter, and this idea runs right through the story in a very powerful way, including in the song "Murrumbidgee Water" that freda posted above.

Sorry if I'm raving a bit, but I'm so excited about this new recording that I can't help it. It's been a long time coming!