I have very good personal associations with it. Also,
Cassandra Mortmain. So thumbs-up here.
It is hard to pair, though; the instinct is to stick it with a one-syllable, but I'm not sure any of the ones I am thinking of really go stylistically with it.
Cassandra Jane - nice but obvious
Cassandra Maud - nice but not quite right somehow
Cassandra Siân - I quite like the san/shan echo but probably nobody else would
Cassandra My - cute if I was Swedish
Cassandra Clover - cute but naaaah
Cassandra Athena - nice but too themey
Cassandra ElaineCassandra LenoreCassandra LilouCassandra Helene