| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 161 | Cadwaladr | Welsh | Battle leader. This name dates back to the 7th century. More commonly used as a surname than a first name in the present day. | M | |
| 162 | Cadwaladyr | Welsh | Variant of Cadwaladr: War leader; battle leader. | M | |
| 163 | Cadwallader | Welsh | Battle leader. This name dates back to the 7th century. More commonly used as a surname than a first name in the present day. | M | |
| 164 | Cadwallen | Welsh | Battle disolver. Also a variant of Cadwallon: Arranges the battle. | M | |
| 165 | Cadwallon | Welsh | Arranges the battle. | M | |
| 166 | Cadwgawn | Welsh | Legendary son of Iddon. | M | |
| 167 | Cadwr | Welsh | Legendary son of Gwlyon. | M | |
| 168 | Cadwy | Welsh | Legendary son of Gereint. | M | |
| 169 | Cadwyn | Welsh | Chain. | F | |
| 170 | Cadyryeith | Welsh | Well spoken. | M | |
| 171 | Caer Llion | Welsh | From Caerleon. | M | |
| 172 | Caerau | Welsh | From the castle. | M | |
| 173 | Caerwyn | Welsh | White fortress. | M | |
| 174 | Caethes | Welsh | Slave. | F | |
| 175 | Cafell | Welsh | Oracle. | F | |
| 176 | Cai | Welsh | A diminutive of Cajus, frequently used as an independent name in Wales. Rejoicer. | M | |
| 177 | Cain | Welsh | Clear water. | M | |
| 178 | Caio | Welsh | Variant of Cai: Joy. | M | |
| 179 | Caius | Welsh | Variant of Cai: Joy. | M | |
| 180 | Calcas | Welsh | Legendary son of Caw. | M | |