| Clodoveo | Famous warrior in battle. |
| Cochiti | A name of a Puebloan tribe. |
| Coco | Abbreviation of Socorro meaning help |
| Coleta | A victorious young woman. |
| Colorado | Spanish for colored or red. |
| Concepcion | Reference to the Immaculate Conception |
| Concetta | Reference to the Immaculate Conception |
| Conchetta | Reference to the Immaculate Conception |
| Conrado | Spanish form of Conrad able counsel |
| Conshita | Reference to the Immaculate Conception |
| Consolacion | One who brings consolation |
| Consolata | The one who brings comfort |
| Constantia | Constancy: steadfastness. |
| Constantino | Derived from the Latin for constant. |
| Constanza | Spanish name meaning constancy. |
| Consuela | Spanish name meaning consolation. |
| Consuelo | Spanish name meaning consolation. |
| Corazana | A name meaning a heart full of love. |
| Corazon | A Spanish name meaning the human heart. |
| Cordero | A Spanish name meaning little lamb. |
| Cornelio | Derived from the Latin word for horn. |
| Cortez | Courteous. Variant of Curtis. The Spanish explorer and adventurer Cortez conquered the Aztec civilization of Mexico with only a small expeditionary force. |
| Cris | Variant abbreviation of Christopher and Christian. |
| Crisann | Variant of Chrysantus |
| Crisanna | Variant of Chrysantus |
| Crista | Appointed one. A Christian. |
| Cristian | Follower of Christ: the Annointed. |
| Cristiano | A devoted follower of Christ. |
| Cristina | Follower of Christ. |
| Cristine | Follower of Christ. |
| Cristo | The Spanish word for Christ. |
| Cristobal | Spanish form of Christopher Christ bearer |
| Cristofer | With Christ inside. |
| Cristofor | With Christ inside. |
| Criston | Follower of Christ: the Annointed. |
| Cristos | Follower of Christ: the Annointed. |
| Cristoval | With Christ inside. |
| Cruz | A name meaning the holy cross. |
| Cuartio | A name meaning the fourth one. |
| Cuarto | A name meaning the number four. |