| Clodomiro | Famous for his glorious battles. |
| Cloud | Named after the fluffy sky vapor. |
| Clova | A name meaning a field of clover. |
| Clyndon | From the hill of the famous. |
| Clyne | Dweller near the river bank. |
| Clyntan | Derived from a settlement near a hill. |
| Clynten | Variant meaning town by the hill. |
| Clynton | Old English for town on a hill. |
| Clyntwood | A forest located near a cliff. |
| Coal | Refers to the black mineral fuel. |
| Coale | An archaic spelling for charcoal. |
| Cobe | A variant of the name Jacob or Jake. |
| Cobey | A variant of the name Colby. |
| Cocoa | Derived from the cacao bean. |
| Coenradd | A bold and wise counselor. |
| Colbie | A form of colby |
| Colean | A variant of the name Colin. |
| Coleane | A feminine form of Colean. |
| Coleene | A variant of the name Colleen. |
| Colie | A diminutive form of Nicole. |
| Coline | A French variant of Nicole. |
| Collet | A French name meaning necklace. |
| Colleta | A variant of the name Coletta. |
| Colmann | A variant of the name Colman. |
| Colte | A name meaning young horse. |
| Commodore | A title meaning a naval commander. |
| Comsuelo | A name meaning one who gives solace. |
| Concha | Spanish word meaning seashell. |
| Conchita | Little shell or small seashell. |
| Coner | An Irish name meaning a lover of hounds. |
| Connaire | An Irish name meaning a hound of the sea. |
| Consalvo | A name meaning a battle or war savior. |
| Constantine Dwyne | Steadfast and darkhaired one. |
| Constantius | Constant, steadfast |
| Constanz | Constant, steadfast |
| Corabel | A beautiful maiden with heart. |
| Corabella | A lovely and beautiful heart. |
| Corabelle | A beautiful, beloved heart. |
| Corabellita | A little beautiful heart. |
| Corah | A maiden who is very virtuous. |