| Claiton | From the town of clay land |
| Claraissa | A bright and famous woman |
| Claretta | A small, clear, and bright soul. |
| Claris | One who is clear and illustrious. |
| Clarise | A clear and shining personality. |
| Clarity | The quality of being very clear. |
| Claron | One who is clear and luminous. |
| Claryce | One who is clear and brilliant. |
| Claudiah | A unique spelling of Claudia. |
| Claudicio | A rare, masculine Latin name. |
| Claudie | A diminutive form of Claudia. |
| Claudino | A masculine, Italian name. |
| Claudon | A variant of the name Claude. |
| Claybourn | Dweller near the clay brook. |
| Clayd | A variant spelling of Clyde. |
| Claytan | A variant spelling of Clayton. |
| Cleland | From a place with clay |
| Clemencio | Meaning merciful and gentle. |
| Clementino | A gentle and kind individual. |
| Clementya | A gentle and merciful person. |
| Clementyn | One who is mild and peaceful. |
| Clementyna | A kind and compassionate soul. |
| Clenton | From the town on the hillside. |
| Cleona | Derived from Greek, means 'glory of the people' |
| Clerissa | A bright and clearminded girl. |
| Clerisse | A woman of clear, pure spirit. |
| Cleryce | One who is clear and distinct. |
| Clerysse | A clear and bright spirit. |
| Cliffeton | From the town by the cliff. |
| Clifftan | Dweller near the steep cliff. |
| Clifften | One from the cliff settlement. |
| Cliffy | A diminutive of cliff dweller. |
| Cliften | From the farm by the cliff. |
| Clindon | From the hill near the cliff. |
| Clintan | Dweller of the stony settlement. |
| Clinten | One from the rocky enclosure. |
| Clintin | From the settlement on a hill. |
| Clo | A short form of the name Chloe. |
| Clodito | A diminutive form of Clodoveo. |
| Clodo | Derived from the word for famous. |