| Caesar | Cafer | Caleb |
| Cali | Calixte | Calogero |
| Calvin | Cameron | Camiel |
| Camil | Camille | Camron |
| Can | Caner | Carl |
| Carlito | Carlo | Carlos |
| Carsten | Cas | Casper |
| Cassien | Cay | Cayden |
| Cebrail | Céderic | Cederic |
| Cedric | Cédric | Cedric |
| Cedrick | Cedrik | Celal |
| Céleste | Celestin | Célestin |
| Celian | Célian | Celio |
| Célio | Celle | Cem |
| Cemal | Cengiz | Cengizhan |
| Cesar | César | Ceylan |
| Cezar | Chad | Chadi |
| Chady | Chahid | Chahine |
| Chaim | Chakib | Chakir |
| Chams | Charel | Charles |
| Charles-Henri | Charlie | Charly |
| Chayan | Chayton | Chen |
| Chendo | Chesney | Chiel |
| Chihab | Chris | Christ |
| Christiaan | Christian | Christiano |
| Christo | Christoph | Christophe |
| Christopher | Christopheur | Chun |
| Cian | Ciel | Cihan |
| Cihat | Cillian | Cinar |
| Ciro | Ciryl | Cis |
| Cisse | Clarence | Claudio |
| Clement | Clément | Clovis |
| Cobe | Coby | Cody |
| Colin | Collin | Colyn |
| Côme | Conner | Connor |
| Conrad | Constant | Constantijn |
| Constantin | Constantinos | Cor |
| Corenthin | Corentin | Corian |
| Corneel | Corto | Costa |
| Cristian | Cristiano | Cruz |
| Curtis | Cyprian | Cyprien |
| Cyrian | Cyriel | Cyril |
| Cyrile | Cyrille | Cyrus |