| Conrado | | kon-RAH-dho | Spanish | |
| Consolata | | kon-so-LAH-tah | Italian | |
| ConstanȚA | | - | Romanian | |
| Constans | | - | Late Roman | |
| Constant | | kawn-STAWN (French), KAHN-stənt (English) | French, English (Rare) | |
| Constantia | | - | Late Roman | |
| Constantin | | kon-stahn-TEEN (Romanian), kawn-stawn-TEN (French) | Romanian, French | |
| Constantina | | - | Late Roman | |
| Constantinus | | - | Late Roman | |
| Constantius | | - | Late Roman | |
| Constanza | | kon-STAHN-thah (Spanish), kon-STAHN-sah (Latin American Spanish) | Spanish | |
| Constanze | | - | German | |
| Consuela | | kon-SWE-lah | Spanish | |
| Consuelo | | kon-SWE-lo | Spanish | |
| Consus | | - | Roman Mythology | |