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| Cade | Cade |
| Caden | Caden |
| Cale | Variant of Caleb |
| Caleb | Caleb |
| Calvin | Calvin |
| Camden | Camden |
| Cameron | Cameron |
| Camron | Variant of Cameron |
| Caoimhin | Variant of Kevin |
| Carey | Carey |
| Carl | Variant of Karl |
| Carlo | Variant of Karl |
| Carlos | Variant of Karl |
| Carlton | Carlton |
| Carson | Carson |
| Carsten | Variant of Christian |
| Carter | Carter |
| Cary | Variant of Carey |
| Cäsar | Cäsar |
| Casey | Casey |
| Caspar | Variant of Jasper |
| Cathán | Cathán |
| Cay | Variant of Kai |
| Cayden | Variant of Caden |
| Cecil | Cecil |
| Cedric | Cedric |
| Cédric | Variant of Cedric |
| Cedrik | Variant of Cedric |
| Cesar | Variant of Cäsar |
| Chad | Chad |
| Chadwick | Chadwick |
| Chance | Chance |
| Chandler | Chandler |
| Charles | Variant of Karl |
| Charlie | Variant of Karl |
| Chase | Chase |
| Chaz | Variant of Karl |
| Chester | Chester |
| Chris | Variant of Christoph |
| Christian | Christian |
| Christóbal | Variant of Christoph |
| Christof | Variant of Christoph |
| Christoph | Christoph |
| Christophe | Variant of Christoph |
| Christopher | Variant of Christoph |
| Cian | Cian |
| Clarence | Clarence |
| Clark | Clark |
| Claude | Variant of Claudius |
| Claudio | Variant of Claudius |
| Claudius | Claudius |
| Clay | Variant of Clayton |
| Clayton | Clayton |
| Clifford | Clifford |
| Clifton | Clifton |
| Clint | Variant of Clinton |
| Clinton | Clinton |
| Clyde | Clyde |
| Coby | Variant of Jacob |
| Codey | Variant of Cody |
| Codie | Variant of Cody |
| Cody | Cody |
| Colby | Colby |
| Cole | Cole |
| Coleman | Variant of Columbano |
| Colin | Variant of Nicholas |
| Collin | Variant of Nicholas |
| Colt | Variant of Colton |
| Colten | Variant of Colton |
| Colton | Colton |
| Columbano | Columbano |
| Conner | Variant of Connor |
| Connor | Connor |
| Conor | Variant of Connor |
| Conrad | Conrad |
| Conradin | Variant of Conrad |
| Conrado | Variant of Conrad |
| Conradus | Variant of Conrad |
| Cooper | Cooper |
| Corbin | Variant of Corvin |
| Cordell | Cordell |
| Corey | Corey |
| Cornel | Variant of Cornelius |
| Cornelio | Variant of Cornelius |
| Cornelis | Variant of Cornelius |
| Cornelius | Cornelius |
| Corrado | Variant of Conrad |
| Cortez | Variant of Curtis |
| Corvin | Corvin |
| Cory | Variant of Corey |
| Coty | Coty |
| Courtney | Courtney |
| Craig | Craig |
| Crispin | Crispin |
| Cristian | Variant of Christian |
| Cristiano | Variant of Christian |
| Cristobal | Variant of Christoph |
| Cristoforo | Variant of Christoph |
| Cristopher | Variant of Christoph |
| Cruz | Cruz |
| Cullen | Cullen |
| Curd | Variant of Curt |
| Curt | Curt |
| Curt | Variant of Curtis |
| Curtis | Curtis |
| Curtiz | Variant of Curtis |
| Curzio | Variant of Curtis |
| Cyrus | Cyrus |