I totally hate Caseb. Hey – you asked! I can’t figure out how to pronounce it, among just a few other concerns.
That said – if you love it for your character, use it. I would somehow weave into the story how it is said. Or picture for us the reaction of others (in your novel world) to the name. Has it colored your character’s experience of life to have this strange name? What is she like? Is she vividly different from her sisters, [name]Daffodil[/name] and [name]Violet[/name]? Are they conventional and pretty while she is – what? In what way is she so remarkably different?
I think [name]Scarlett[/name] was an unusual choice at the time [name]Margaret[/name] [name]Mitchell[/name] wrote Gone with the Wind. (I’m open to learning I’m wrong about this.) Now you can’t think of [name]Scarlett[/name] as anything but [name]Scarlett[/name]. I think if you come up with the right back story, you can pull off just about anything, any name, in your novel.
You might start with exploring why you chose this name and how you view the name. [name]Do[/name] you think it is – pretty, rebellious, withdrawn, intelligent, observant, outgoing, social, weird, clunky – what?