Prometheus isn't the only fire thief in mythology, most ancient mythoses have that sequence in one form or another.
true, but most don't really sound as well or don't fit for other reasons,
Prometheus works well in an american setting due to it's well known origin in Greek mythology.
Azazel has way to many demonic/evil connotations,
maui is kindah meh as a name for a girl but could be done,
Spider would work as well, wouldn't be obvious and would be a throwback to the original work but spiders aren't exactly cuddly if you know what i mean.
coyote, beaver or dog are all kind of meh,
Crow could work as it sounds edgy enough to be viable and it lacks the absolutely evil connotations as well as other damming markers, hell the whole thief aspect would come out perfectly with crows but animal names aren't that great for a superhero unless you use the animal within the theme of your powers.
rabbit is too tame.
Nanabohzo might work but it's long, relatively complicated for a name and therefor forgettable.
Amirani is actually probably the best name, due to it sounding feminine, its obscurity and its simplicity, but it lacks the impact of something as well known as prometheus or Azazel