| Name | Meaning | Gender | Origin |
|---|
| Cain | A spear | Male | Hebrew |
| Cairbre | Strong Man | Male | Celtic |
| Cale | Uncertain, perhaps slender | Male | Gaelic |
| Calhoun | Warrior | Male | English |
| Cameron | Crooked nose | Unisex | Gaelic |
| Campbell | Crooked mouth | Male | Gaelic |
| Camren | Crooked nose | Male | Gaelic |
| Camron | Crooked nose | Male | Gaelic |
| Camryn | Crooked nose | Unisex | Gaelic |
| Caolan | Slender | Unisex | English |
| Carey | Well loved | Male | Gaelic |
| Carlin | Descendant of Cearbhallán | Male | Gaelic |
| Carrick | Rock | Male | Gaelic |
| Carson | Son Of Carr | Male | Gaelic |
| Casey | From Cayce | Male | American English |
| Cassidy | Curly | Male | Gaelic |
| Cat | Catlike | Unisex | English |
| Cathal | Powerful in battle | Male | Gaelic |
| Cavan | Beautiful at birth | Male | Gaelic |
| Ceallach | War | Male | Gaelic |
| Christian | Follower of Christ | Male | Latin |
| Cian | Ancient | Male | Gaelic |
| Cillian | War | Male | Gaelic |
| Clancy | Red | Male | Gaelic |
| Clarence | Of Clare | Male | English |
| Clyde | Refers To The Scottish Clyde River. | Male | Gaelic |
| Codey | Descendant of Cuidighthigh | Male | Gaelic |
| Codie | Descendant of Cuidighthigh | Male | Gaelic |
| Cody | Descendant of Cuidighthigh | Male | Gaelic |
| Coleman | Dove | Male | Gaelic |