I've always said da-NAY, but since I don't know of anyone with this name, I could easily be wrong.
Danae: I like it!
While I like the name
Cassandra on its own, something about the flow of the two names together seems a little bit off to me.
Danae Amaranth?
Danae Hestia? Hmm, this one is tough...
Sorry I'm not much help on mn suggestions, but I do like
Danae, and
Cassandra would be pretty with something else (I like your
Maren Cassandra combo on your namelist).