| Cobreigen | Old English name, possibly meaning 'bright ruler' or 'shining lord' |
| Cocca | Old English name, possibly meaning 'curly-haired' or 'ringed' |
| Coelfrid | Old English name, possibly meaning 'elf peace' or 'elf friend' |
| Coeman | Old English name, possibly meaning 'people's ruler' or 'common lord' |
| Coenhelm | Old English name, possibly meaning 'people's helmet' or 'common protection' |
| Coenred | Old English name, possibly meaning 'people's counsel' or 'common advice' |
| Coenwalh | Old English name, possibly meaning 'people's ruler' or 'common lord' |
| Cofa | Old English name, possibly meaning 'calf' or 'young bull' |
| Cofsi | Old English name, possibly meaning 'battle victory' or 'warrior's triumph' |
| Cohha | Old English name, possibly meaning 'battle' or 'warrior' |
| Coifi | Old English name, possibly meaning 'battle' or 'warrior' |
| Coilbrit | Old English name, possibly meaning 'battle Briton' or 'warrior of Britain' |
| Coimagni | Old English name, possibly meaning 'battle mighty' or 'warrior strong' |
| Coimagnus | Old English name, possibly meaning 'battle great' or 'warrior powerful' |
| Coineus | Old English name, possibly meaning 'battle noble' or 'warrior noble' |
| Colea | Swarthy; Black; Black-haired |
| Collen | Victorious People; Hazel Tree |
| Collibe | Old English name, possibly meaning 'battle people' or 'warrior's tribe' |
| Collye | Diminutive form of Colin, meaning 'pup' or 'young dog' |
| Comm | A short form of common names. |
| Commius | Latin name meaning 'of the people' or 'public' |
| Conbrinun | Possibly derived from 'con' meaning 'with' and 'brinun' meaning 'raven' |
| Concenn | Old Welsh name meaning 'fair' or 'white' |
| Condaf | Possibly derived from 'con' meaning 'with' and 'daf' meaning 'dove' |
| Condede | Old Welsh name meaning 'chief' or 'lord' |
| Conerad | Possibly derived from 'con' meaning 'with' and 'erad' meaning 'noble' |
| Conetoci | Possibly derived from 'con' meaning 'with' and 'etoci' meaning 'noble' |
| Conewalch | Old English name meaning 'with noble power' |
| Confur | Possibly derived from 'con' meaning 'with' and 'fur' meaning 'man' |
| Congen | Old English name meaning 'born of the family' |
| Conguean | Possibly derived from 'con' meaning 'with' and 'guean' meaning 'white' |
| Conhinoci | Possibly derived from 'con' meaning 'with' and 'hinoci' meaning 'noble' |
| Conhinog | Possibly derived from 'con' meaning 'with' and 'hinog' meaning 'noble' |
| Conlec | Possibly derived from 'con' meaning 'with' and 'lec' meaning 'bright' |
| Conoc | Possibly derived from 'con' meaning 'with' and 'oc' meaning 'noble' |
| Conthigirni | Great lord, great ruler |
| Conuan | Little dog, small dog |
| Conuetu | Gathering, assembly |
| Conuoge | Gathering, assembly |
| Coppa | Derived from a cup or vessel |