| Concepcion | Reference To The Immaculate Conception | Female |
| Concetta | From The Immaculate Conception | Female |
| Conchetta | Reference To The Immaculate Conception | Female |
| Conrado | Honest Advisor | Male |
| Conshita | Reference To The Immaculate Conception | Female |
| Consolacion | Consolation | Female |
| Consolata | Consolation | Female |
| Constantia | Constancy: Steadfastness. | Female |
| Constantino | Constant | Male |
| Constanza | Constant | Female |
| Consuela | Consolation | Female |
| Consuelo | Consolation | Female |
| Cooper | Makes Barrels | Male |
| Corazana | Heart. | Female |
| Corazon | Heart | Female |
| Cordero | "Lamb, Sheep." | Male |
| Cornelio | Horn | Male |
| Cortez | Courteous. Variant Of Curtis. The Spanish Explorer And Adventurer Cortez Conquered The Aztec Civilization Of Mexico With Only A Small Expeditionary Force. | Male |
| Cris | Variant Abbreviation Of Christopher And Christian. | Male |
| Crisann | Variant Of Chrysantus | Female |
| Crisanna | Variant Of Chrysantus | Female |
| Crista | Appointed One. A Christian. | Female |
| Cristian | Follower Of Christ: The Annointed. | Male |
| Cristiano | Christian | Male |
| Cristina | Follower Of Christ. | Female |