| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 341 | Claus | Latin | Lame. | M | |
| 342 | Clem | Latin | Diminutive of Clement. Also from 'clemens' meaning mild or merciful. | M | |
| 343 | Clemence | Latin | Merciful. | M | |
| 344 | Clement | Latin | From 'clemens' meaning mild or merciful. Famous bearer: The British nursery rhyme Oranges and Lemons' refers to a church dedicated to St Clement, a disciple of St Paul who became a first century pope; 14 popes have been named Clement. | M | |
| 345 | Clemente | Latin | Merciful. | M | |
| 346 | Clodius | Latin | Lame. | M | |
| 347 | Clovis | Latin | Renowned fighter. Variant of Louis. | M | |
| 348 | Cocles | Latin | A hero who saved Rome. | M | |
| 349 | Colon | Latin | Dove. | M | |
| 350 | Columba | Latin | Dove. Famous bearer, 6th century Irish abbot and missionary St Columba converted the inhabitants of Scotland and northern England to Christianity. | M | |
| 351 | Constant | Latin | Variant of Constantine: Constant, steadfast, from the Latin 'constans'. | M | |
| 352 | Constantine | Latin | Constant, steadfast, from the Latin 'constans' Famous bearers: several Roman and Byzantine emperors including Constantine the Great, the Christian emperor who made Christianity the official religion of the Roman Empire. | M | |
| 353 | Constantino | Latin | Constant. | M | |
| 354 | Constantios | Latin | Constant. | M | |
| 355 | Corbin | Latin | Raven. | M | |
| 356 | Cornel | Latin | Variant of Cornelius 'horn; hornblower.'. | M | |
| 357 | Cornelio | Latin | Horn. | M | |
| 358 | Cornelious | Latin | Variant of Cornelius: Horn. | M | |
| 359 | Cornelius | Latin | From a Roman clan name which is derived from the Latin 'cornu' meaning horn. Famous bearers - a devout centurion converted to Christianity by St Peter, a 3rd-century pope, American Cornelius Vanderbilt and a number of his descendants. | M | |
| 360 | Cornell | Latin | Variant of Cornelius 'horn; hornblower.'. | M | |