It’s a good example of a name variation that could basically only be Australian. We saw similar evolution in the 80s and 90s as
Tiana led to Tiane and then Tiarne;
Ariana has been popular in Aus for long enough now to have spawned
Ariane -> Ariarne.
I think it’s cute, though not something I would personally use.
https://nanowrimo.org/participants/christine-seaforth-finch
http://christineseaforthfinch.blogspot.com/