Nickname For: Casey, Cassius and Cassidy

Narrative: This Roman family name might have originated with any one of several words: cassis (helmet), cassus (empty) or casso (to shake).

Nickname For: Casey, Cassandra and Cassidy

Narrative: It is possible that this name is a form of Alexander (''warrior's protector''), which originated as a feminine name -- in fact, a by-name for Hera, queen of the Olympian gods.

In Greek legend, Cassandra was the name of a prophetess whose unerring predictions were perpetually doomed to fall on unbelieving ears.