Thank you, Bob. Now I am really hopeful. I never saw the group or the album; will ask my brother about their roots. Something about Peda's writings (two or three letters before the disappearance) made me think he was aboriginal; seems he mentioned another person with a European name but who could know as names get swapped so freely. Appearance at a Celtic festival is interesting; they do some Irish material, with didgeridoo and some Oz trad suggestions in the arrangements. I gather a mixed group is not likely.
Thanks for the history link. The spelling variant is noted and could help.