| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 201 | Caswallon | Welsh | Legendary son of Beli. | M | |
| 202 | Cath | Welsh | Cat. | F | |
| 203 | Catrin | Welsh | Pure, clear. A Welsh variant of 'Catherine', which is a French form of the Latin 'Katharina', from the Greek Aikaterina'. | F | |
| 204 | Caw | Welsh | Full of joy. | M | |
| 205 | Cawrdav | Welsh | Legendary son of Caradawg. | M | |
| 206 | Ccri | Welsh | Loved one. | F | |
| 207 | Ccri | Welsh | Loved one. | M | |
| 208 | Cedric | Welsh | War leader; gift of splendor. | M | |
| 209 | Cedrick | Welsh | Variant of Cedric: War leader; gift of splendor. | M | |
| 210 | Cedrik | Welsh | Gift of splendor. | M | |
| 211 | Cedrych | Welsh | Variant of Cedric: War leader; gift of splendor. | M | |
| 212 | Ceinwen | Welsh | Beautiful gems. | F | |
| 213 | Ceithin | Welsh | Legendary uncle of Lugh. | M | |
| 214 | Cerdic | Welsh | Cherished. | M | |
| 215 | Ceredig | Welsh | Variant of Cerdic: Cherished. | M | |
| 216 | Ceretic | Welsh | Variant of Cerdic: Cherished. | M | |
| 217 | Ceridwen | Welsh | From 'cerdd' meaning poetry and 'gwen' meaning fair or white. Famous bearer: Ceridwen, the Welsh goddess of poetic inspiration. | F | |
| 218 | Cerys | Welsh | Variant of Carys: Love. | F | |
| 219 | Cheryl | Welsh | Variant of Carys: Love. | F | |
| 220 | CIyde | Welsh | Loud voiced. | M | |