having NOTHING to do with Montana Cheyenne (yuck!):
When I was a smallish kid decades ago, an Australian couple lived in the flat upstairs from us (in the eastern US). They had a baby daughter named Jilba, which they said was Aborigine for "waterhole". I've never heard this name since, but I wonder if it's a name you've heard of and/or if the meaning is legit.
(Tragically, the family moved back to Oz after a few years. Soon after their return, the parents were killed in a road accident in NSW. The daughter wasn't with them, but I never learned what became of her.)
Lemme know if you have any info on the name, please,