I love it. It's intriguingly pretty and it's a bit better than
Anthea, as much as I love the name.
Thea isn't really an ideal nickname; I'd go for Mal (or Mali) or
Ami.
Possible MNs:
Amalthea LouiseAmalthea DanaeAmalthea EvaAmalthea KatarinaAmalthea MinervaAmalthea Minerva