For a girl,
Cassie is a nn for
Cassandra to me. I don't like most nn names because they restrict options: your daughter may like
Cassie, but on the other hand she may prefer to go by
Cassandra,
Cass,
Sandra, Andie, or another nn. If she's called
Cassie she has no other options but to go by either
Cassie or
Cass.
Cassandra Courtney is nice. I've come to really like some kinds of alliteration, like this one.
Miranda
Proud adopter of 15 punctuation marks; see my profile for their names.