Estacia sounds very pretty said out loud but my brain did have to do about 3 reads to get it right.
Celeste nn Lessi is interesteing cause
Celeste really doesn't have any striking nicknames but I guess Lessi makes sense although I don't like it. I recon my nn of choice for
Celeste would be
Essie (or maybe
Ellie).
https://www.behindthename.com/pnl/145466