Someone I know loves this name and its pronunciation is much prettier in their language: Cass-ee-oh-PAY-ah. In terms of Cass-names, this one is among my favourites.
Cassiopeia is one of the few constellations I can remember and occasionally find, I always look for it.
I think it's a lovely name and I wish I saw it used more often on real people! I rather like that it's tied to the concept of vanity, it makes it so dramatic. The
Cassiopeia supernova is incredibly beautiful.