| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 61 | Ceinwen | Welsh | Beautiful gems. | F | |
| 62 | Ceridwen | Welsh | From 'cerdd' meaning poetry and 'gwen' meaning fair or white. Famous bearer: Ceridwen, the Welsh goddess of poetic inspiration. | F | |
| 63 | Cerys | Welsh | Variant of Carys: Love. | F | |
| 64 | Cheryl | Welsh | Variant of Carys: Love. | F | |
| 65 | Cordelia | Welsh | Jewel of the sea. | F | |
| 66 | Corsen | Welsh | Reed. | F | |
| 67 | Cragen | Welsh | Shell. | F | |
| 68 | Creiddylad | Welsh | Jewel of the sea. | F | |
| 69 | Cymreiges | Welsh | Welsh woman. | F | |
| 70 | Daere | Welsh | Fiend. | F | |
| 71 | Dee | Welsh | Dark. | F | |
| 72 | Delia | Welsh | Dark. | F | |
| 73 | Delwen | Welsh | Derived from the Welsh words for neat and fair. | F | |
| 74 | Delwyn | Welsh | Derived from the Welsh words for neat and fair. | F | |
| 75 | Delyth | Welsh | Derived from the Welsh words for neat and pretty. | F | |
| 76 | Dera | Welsh | Fiend. | F | |
| 77 | Derwen | Welsh | From the oak tree. | F | |
| 78 | Deryn | Welsh | Bird. From the word 'aderyn'. | F | |
| 79 | Dicra | Welsh | Slow. | F | |
| 80 | Dierdre | Welsh | Dark. | F | |