| Colvyr | A modern variation of Colvin |
| Colwin | Variant of Colwyn: Name of a river in Wales. |
| Colwyn | A river in Wales. |
| Colyer | Charcoal merchant |
| Colyn | Variant of Colin: Of a triumphant people; young boy. |
| Colys | Son of the dark man |
| Colywnn | Variant of Colwyn: Name of a river in Wales. |
| Com | A shortened form of community |
| Coman | A name meaning noble or brave |
| Comdhan | Variant of Comhghan: Twin. |
| Comfort | To provide solace or relief. |
| Comforte | A state of physical ease. |
| Comhghall | A Gaelic name meaning battle. |
| Comhghan | Born of a battle or conflict. |
| Cominius | The Tragedy of Coriolanus.' Titus Lartius, a general against the Volscians. |
| Compton | From the Farm in the Valley |
| Comyn | Derived from a Scottish surname. |
| Comyna | A feminine form of the Comyn. |
| Con | A short form meaning wise wolf. |
| Conaire | Meaning hound of the sea king. |
| Conal | Strong as a wolf in the wild. |
| Conall | Strong in battle High: mighty. |
| Conan | Little wolf or hound of war. |
| Conant | Derived from the Gaelic for hound. |
| Conary | An ancient Irish name whos meaning is lost in antiquety |
| Concepcion | Reference to the Immaculate Conception |
| Concepta | Refers to the Immaculate Conception |
| Conception | Refers to the act of conceiving. |
| Concetta | Reference to the Immaculate Conception |
| Concetto | Reference to the Immaculate Conception. |
| Conchetta | Reference to the Immaculate Conception |
| Conchobar | Means lover of the hounds or dogs. |
| Conchobara | Feminine form of Connor strong willed |
| Conchobarra | Feminine form of Connor strong willed |
| Conchobarre | Feminine form of Connor strong willed |
| Conchobhar | Strong willed or wise |
| Concobhar | Variant of Conchobhar: Strong dog; strong willed or wise. |
| Concord | Unity; Accord; Harmony |
| Concordea | A name meaning peace and harmony. |
| Concordia | Roman goddess of social harmony. |