I think all the Jason’s I know are called Jace/Jase, and it’s the nickname which makes the most sense to me.
Cas(s) for
Casper is fine, I actually quite like it. I don’t think
Cassie would be weird at all.
I would use the nickname
Liv for
Lavinia.
Nora comes most naturally for
Annora.
Jagoda
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