'borax' in the sense of 'borak' first occurs in 1944, a hundred years after 'borak'.

Furthermore, I have now researched who the Wathawurung were, and have to share this with you all. They lived in the area west of Melbourne, from Ballarat to the coast. Ballarat lies by Lake Wendouree. Both names are Wathawurung. The story is that the lake got its name when William Yuille, who pastoralist who founded the Ballaarat (sic) station, asked a native woman its name and she said wendaaree, 'go away'.