| Casleu | Rashness, confidence. |
| Casluhim | Hopes of life. |
| Casnar | Legendary nobleman. |
| Caspar | Derived from the Persian word for treasurer. |
| Casper | "Friendly, childlike, helpful" |
| Casperia | Second wife of Rhoetus. |
| Caspian | Referring to the sea between Asia and Europe. |
| Cass | A short form of names like Cassandra or Cassidy. |
| Cassadee | Cassadee is a feminine given name derived from the French surname 'Cassadée,' meaning 'bringer of peace.' |
| Cassady | Variant of Cassidy: Intelligent; from Caiside; curly-headed. |
| Cassandan | Name of One Kurosh the Greats Wife |
| CASSANDRA | myth name (a prophetess no one believed) |
| Cassandrea | Unheeded prophetess. Cassandra was a Trojan prophetess, daughter of King Priam. In Homer's 'The Iliad' Cassandra's prediction of the fall of Troy was unheeded. |
| Cassara | Prophet/princess |
| Cassaundra | Unheeded prophetess. Cassandra was a Trojan prophetess, daughter of King Priam. In Homer's 'The Iliad' Cassandra's prediction of the fall of Troy was unheeded. |
| Cassey | An Irish name meaning vigilant or watchful. |
| Cassi | Abbreviation of Cassandra. Unheeded prophetess. In Homer's 'The Iliad' Cassandra's prediction of the fall of Troy was unheeded. |
| Cassia | Named after the fragrant cinnamonlike spice. |
| Cassian | A Latin name meaning hollow or empty vessel. |
| CASSIBELLAUNUS | A historic ancient British tribal leader. |
| Cassidy | Clever: Curly-headed. |
| CASSIE | A diminutive form meaning helper or defender. |
| Cassiel | The guardian of Capricornians. |
| Cassio | The Tragedy of Othello, Moor of Venice' Lieutenant to Othello. |
| CASSIOPEIA | myth name (mother of Andromeda) |
| Cassius | Protective cover |
| Cassivellaunus | From Arthurian legend |
| Cassondra | Form of Cassandra. Unheeded prophetess. |
| Casswallawn | Legendary son of Beli. |
| Cassy | Abbreviation of Cassandra. Unheeded prophetess. In Homer's 'The Iliad' Cassandra's prediction of the fall of Troy was unheeded. |
| Casta | A Latin term meaning pure, chaste, or virtuous. |
| CASTALIA | myth name (sacred fountain of the Muses) |
| Castel | A name derived from the word for a fortress. |
| Caster | From the Roman camp |
| Castimer | Variant of Casimir: Bringer of peace; announcing peace. |
| Castle | A large fortified building. |
| CASTOR | myth name (brother of Helen) |
| Caswallan | From Arthurian legend |
| Caswallon | Legendary son of Beli. |
| Caswell | From an Area with Watercress |