Already a lot of fab suggestions, but what about:
Tahnee Cottesloe
Kirrily Esperance
Hazel Prevelly
Margaret Avalon
Adelaide Anglesea
Nell Sorrento
I like your names though I would t have Airlie after Indiana - just doesn’t flow as well as the other imo. I like Airlie in top spot somehow. I know you want Y/ie as a nickname but I really like in as a first (I love Indiana too just not together). I also think there are too many M’s in Summer Marlo and would if anything have it the other way, Marlo Summer. The other two are great, wouldn’t change.