(Tho I'm not sure if Babs giving Cass her name is regular continuity??)
I don't think I've actually read Cass's first comic appearances during NML. But Babs is the only person I can think of who would name her Cassandra. Before Cass appeared, IIRC there were a number of instances where Barbara used "Cassandra" as a fake name. And there's the Cassandra from Greek mythology who had dreams about the future and made prophecies or whatever. I could be wrong but I think that makes Cassandra count as an oracle of sorts, so there's a connection.