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| Name | Meaning | Gender | Origin |
| Circe | A witch. | F | Greek |
| Circehyll | Lives at the church hill. | M | English |
| Ciri | Variant of Cyril. | F | Italian |
| Cirila | Lordly | F | Greek |
| Ciro | Ancient Egyptian Wind | M | Greek |
| Cirocco | Ancient Egyptian Wind | M | Italian |
| Cisco | Frenchman. | M | Spanish |
| Cisleu | Rashness/ confidence. | E | Biblical |
| Cissy | From the name CECILIA | F | Latin |
| CIywd | Loud voiced. | M | Welsh |
| Claas | People's victory. | M | Greek |
| Clach | Stone. | M | Scottish |
| Cladian | Lame. | M | Latin |
| Clady | Danish form of Claudia. | F | Danish |
| Claec | Dark. | M | English |
| Claefer | Clover. | F | English |
| Claeg | Mortal. | M | English |
| Claegborne | From the clay brook. | M | English |
| Claegtun | Mortal. | M | English |
| Claire | Clear/ bright | F | French |
| Clamedeus | Name of a king. | M | Arthurian Legend |
| Clancy | red-headed fighter | M | Irish |
| Clara | Clear/ Bright | F | Latin |
| Clarabelle | bright and beautiful | F | Latin |
| Clarahelle | Shining. | F | Latin |
| Claral | Clear/ Bright | F | French |
| Clarance | Variant of Clarence: Clear. | M | English |
| Clare | Clear | F | English |
| Clarence | Clear/ Luminous | M | Latin |
| Clarice | Clear/ Bright | F | French |
| Clarimonde | Brilliant Protector | F | German |
| Clarissa | Brilliant | F | Latin |
| Clark | Clergyman | M | French |
| Clarke | From the name CLARK | M | French |
| Claude | Lame | M | Latin |
| Claudette | Lame | F | French |
| Claudia | Lame | F | Latin |
| Claudio | Lame | M | Latin |
| Clay | Immortal | M | English |
| Clayborne | brook near the clay pit | M | English |
| Clayland | From the name CLAYTON | M | English |
| Clayton | Town on Clay Land | M | English |
| Clea | From the name CLEO | F | Greek |
| Cleantha | In Praise of Flowers | F | Greek |
| Cleary | learned | M | Irish |
| Cleatus | Illustrious | M | Greek |
| Cleavant | A Steep Bank | M | English |
| Cleave | From the name CLEAVON | M | English |
| Cleavon | From the name CLEAVANT | M | English |
| Clem | From the name CLEMENT | M | English |