| Chukwuemeka | God has done great things | 👦 Boy | Igbo | — |
| Chukwuka | God is greater | 👦 Boy | Igbo | — |
| Chukwuma | God knows | 👦 Boy | Igbo | — |
| Chun | Spring (春) | 👧 Girl | Chinese | — |
| Chun-chieh | Outstanding talent (俊傑) | 👦 Boy | Chinese | — |
| Chun-kit | Outstanding talent (俊傑, Cantonese) | 👦 Boy | Cantonese | — |
| Chuy | God is salvation (Jesús) | 👦 Boy | Spanish | — |
| Chyngyz | Genghis; Universal ruler | 👦 Boy | Kyrgyz | — |
| Cian | Ancient; Enduring | 👦 Boy | Irish | — |
| Ciara | Dark | 👧 Girl | Irish | — |
| Ciarán | Little dark one | 👦 Boy | Irish | — |
| Cibele | Cybele, the mother goddess | 👧 Girl | Portuguese | — |
| Çiçek | Flower | 👧 Girl | Turkish | — |
| Cicero | Chickpea; After the Roman orator Cicero | 👦 Boy | Portuguese | — |
| Cielo | Sky; Heaven | 👧 Girl | Spanish | — |
| Cierra | Mountain range | 👧 Girl | English | — |
| Çiğdem | Crocus | 👧 Girl | Turkish | — |
| Cihan | World; Universe | 👦 Boy | Turkish | — |
| Cihangir | World conqueror | 👦 Boy | Turkish | — |
| Cihat | Striving; Struggle | 👦 Boy | Turkish | — |
| Cillian | Little church; Bright-headed | 👦 Boy | Irish | — |
| Cindy | From Mount Kynthos (Cynthia) | 👧 Girl | English | — |
| Cinta | Love | 👧 Girl | Indonesian | — |
| Cinthia | From Mount Kynthos (Cynthia) | 👧 Girl | Spanish | — |
| Cinthya | From Mount Kynthos (Cynthia) | 👧 Girl | Spanish | — |
| Cintia | From Mount Kynthos (Cynthia) | 👧 Girl | Spanish | — |
| Cinzia | From Mount Kynthos (Cynthia) | 👧 Girl | Italian | — |
| Ciprian | From Cyprus | 👦 Boy | Romanian | — |
| Cira | Sun; Throne (Cyrus) | 👧 Girl | Italian | — |
| Cirilo | Lordly (Cyril) | 👦 Boy | Spanish | — |
| Ciro | Sun; Throne (Cyrus) | 👦 Boy | Italian | — |
| Citlali | Star | 👧 Girl | Nahuatl | — |
| Citlalli | Star | 👧 Girl | Nahuatl | — |
| Citlaly | Star | 👧 Girl | Nahuatl | — |
| Citra | Image; Beauty | 👧 Girl | Indonesian | — |
| Çınar | Plane tree | 👦 Boy | Turkish | — |
| Claes | Victory of the people (Nicholas) | 👦 Boy | Swedish | — |
| Clair | Clear; Bright | 👧 Girl | French | — |
| Claire | Clear; Bright | 👧 Girl | French | — |
| Clara | Bright; Clear | 👧 Girl | International, Portuguese | — |
| Clare | Clear; Bright | 👧 Girl | English | — |
| Clarence | Bright; From Clare | 👦 Boy | English | — |
| Claribel | Bright and beautiful | 👧 Girl | Spanish | — |
| Clarice | Bright; Famous | 👧 Girl | Portuguese | — |
| Clarissa | Bright; Famous | 👧 Girl | Latin | — |
| Clarisse | Bright; Famous | 👧 Girl | French | — |
| Clark | Clerk; Scholar | 👦 Boy | English | — |
| Claude | Lame (Roman family name Claudius) | 🧒 Unisex | French | — |
| Claudete | From the Roman family name Claudius | 👧 Girl | Portuguese | — |
| Claudette | From the Roman family name Claudius | 👧 Girl | French | — |
| Claudia | From the Roman family name Claudius | 👧 Girl | Spanish | — |
| Claudie | From the Roman family name Claudius | 👧 Girl | French | — |
| Claudine | From the Roman family name Claudius | 👧 Girl | French | — |
| Claudio | From the Roman family name Claudius | 👦 Boy | Italian | — |
| Claudiu | From the Roman family name Claudius | 👦 Boy | Romanian | — |
| Claus | Victory of the people (Nicholas) | 👦 Boy | German | — |
| Clay | Clay; Maker of clay | 👦 Boy | English | — |
| Clayton | Settlement on clay | 👦 Boy | English | — |
| Clelia | Glory; Fame | 👧 Girl | Italian | — |
| Clémence | Mercy; Gentleness | 👧 Girl | French | — |
| Clemencia | Mercy; Clemency | 👧 Girl | Spanish | — |
| Clemens | Merciful; Gentle | 👦 Boy | German | — |
| Clément | Merciful; Gentle | 👦 Boy | French | — |
| Clemente | Merciful; Gentle | 👦 Boy | Italian | — |
| Clementina | Merciful; Gentle | 👧 Girl | Italian | — |
| Clémentine | Merciful; Gentle | 👧 Girl | French | — |
| Cletus | Called forth | 👦 Boy | Greek | — |
| Cliff | Cliff; Slope | 👦 Boy | English | — |
| Clifford | Ford by a cliff | 👦 Boy | English | — |
| Clifton | Town on a cliff | 👦 Boy | English | — |
| Clint | Hill settlement (Clinton) | 👦 Boy | English | — |
| Clinton | Hill settlement | 👦 Boy | English | — |
| Clive | Cliff; Slope | 👦 Boy | English | — |
| Clodagh | After the River Clodagh | 👧 Girl | Irish | — |
| Cloé | Green shoot | 👧 Girl | French | — |
| Clorinda | Green; Fresh (the heroine of Tasso's poem) | 👧 Girl | Italian | — |
| Clothilde | Famous in battle | 👧 Girl | French | — |
| Clotilde | Famous in battle | 👧 Girl | French | — |
| Clovis | Famous warrior (the Frankish king) | 👦 Boy | French | — |
| Clyde | After the River Clyde | 👦 Boy | Scottish | — |
| Cobus | Supplanter (Jacobus) | 👦 Boy | Afrikaans | — |
| Cody | Helpful; Cushion | 👦 Boy | Irish | — |
| Coen | Bold counsel (Koenraad) | 👦 Boy | Dutch | — |
| Colby | Coal settlement | 👦 Boy | English | — |
| Cole | Coal-black; Victory of the people | 👦 Boy | English | — |
| Colette | Victory of the people | 👧 Girl | French | — |
| Colin | Young creature; Victory of the people | 👦 Boy | Scottish | — |
| Coline | Victory of the people | 👧 Girl | French | — |
| Colleen | Girl | 👧 Girl | Irish | — |
| Collen | Young creature (Colin) | 👦 Boy | English | — |
| Collette | Victory of the people | 👧 Girl | French | — |
| Collin | Young creature; Victory of the people | 👦 Boy | English | — |
| Collins | Son of Colin | 👦 Boy | English | — |
| Colm | Dove | 👦 Boy | Irish | — |
| Colomba | Dove | 👧 Girl | Italian | — |
| Colton | Coal town | 👦 Boy | English | — |
| Comfort | Comfort | 👧 Girl | English | — |
| Conceição | Immaculate Conception | 👧 Girl | Portuguese | — |
| Concepcion | Immaculate Conception | 👧 Girl | Spanish | — |
| Concetta | Immaculate Conception | 👧 Girl | Italian | — |
| Concettina | Immaculate Conception | 👧 Girl | Italian | — |
| Concetto | Immaculate Conception | 👦 Boy | Italian | — |
| Concha | Immaculate Conception (Concepción) | 👧 Girl | Spanish | — |
| Conchita | Immaculate Conception (Concepción) | 👧 Girl | Spanish | — |
| Confidence | Confidence; Trust | 👧 Girl | English | — |
| Conner | Lover of hounds | 👦 Boy | Irish | — |
| Connie | Constancy; Steadfast | 👧 Girl | English | — |
| Connor | Lover of hounds | 👦 Boy | Irish | — |
| Conny | Constancy; Horn (Cornelia) | 👧 Girl | German | — |
| Conor | Lover of hounds | 👦 Boy | Irish | — |
| Conrad | Bold counsel | 👦 Boy | German | — |
| Consiglia | Counsel (Our Lady of Good Counsel) | 👧 Girl | Italian | — |
| Constança | Constancy; Steadfast | 👧 Girl | Portuguese | — |
| Constance | Constancy; Steadfast | 👧 Girl | French | — |
| Constantin | Constant; Steadfast | 👦 Boy | Romanian | — |
| Constanza | Constancy; Steadfast | 👧 Girl | Spanish | — |
| Consuelo | Consolation | 👧 Girl | Spanish | — |
| Cooper | Barrel maker | 👦 Boy | English | — |
| Cor | Horn (Cornelis) | 👦 Boy | Dutch | — |
| Cora | Maiden | 👧 Girl | Greek | — |