It's kind of cool, but I never know whether it is correctly spelled
Sybil or
Sibyl.
It reminds me of the
Harry Potter character who was crazy but fun :)
I wouldn't use it but I'd like to see it used more. It has an unusual sound and is not the bland
Ava,
Eva,
Anna,
Emma,
Ella thing (nothing against those names, I like many currently popular names, but they all sound so similar).