| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 181 | CaledvwIch | Welsh | Legendary Excalibur, King Arthur's sword. | M | |
| 182 | Camedyr | Welsh | Legendary son of Govynyon. | M | |
| 183 | Caniad | Welsh | Song. | F | |
| 184 | Cant | Welsh | White. | M | |
| 185 | Caradawg | Welsh | Legendary father of Eudav. | M | |
| 186 | Caradoc | Welsh | Affection; amiable. Famous bearer: First century British king Caradoc, better known as King Caractacus. | M | |
| 187 | Caradog | Welsh | Variant of Caradoc: Affection; amiable. | M | |
| 188 | Carey | Welsh | Near the castle; from the castle. | M | |
| 189 | Carne | Welsh | Variant of English surname Cairn meaning landmark or memorial of piled-up stones. | M | |
| 190 | Carthage | Welsh | Variant of Caradoc: Affection; amiable. | M | |
| 191 | Carwyn | Welsh | Variant of Caerwyn: White fortress. | M | |
| 192 | Cary | Welsh | From the castle. 'Loving.'. | M | |
| 193 | Caryl | Welsh | Variant of Carys: Love. | F | |
| 194 | Carys | Welsh | Love. | F | |
| 195 | Cas | Welsh | Legendary son of Seidi. | M | |
| 196 | Casnar | Welsh | Legendary nobleman. | M | |
| 197 | Cass | Welsh | Curly-headed. | M | |
| 198 | Cassian | Welsh | Curly-headed. | M | |
| 199 | Cassidy | Welsh | Curly-headed. | M | |
| 200 | Casswallawn | Welsh | Legendary son of Beli. | M | |