| Cadwyn | A Welsh name meaning a small chain. |
| Cadyryeith | An old name meaning battle speech. |
| Caerau | From the castle. |
| Caerwyn | Derived from the Welsh elements caer 'fortress' and gwyn 'white, fair'. |
| Caethes | A name of uncertain Greek origin. |
| Cafell | A variant of the name for a hound. |
| Caio | Variant of Cai: Joy. |
| Calcas | Legendary son of Caw. |
| CaledvwIch | Legendary Excalibur, King Arthur's sword. |
| Cambree | A variant of the name Cambria. |
| Camedyr | Legendary son of Govynyon. |
| Candy | Bright, Sweet; Diminutive of Candace: Famous bearer: American actress Candice Bergen.; Diminutive of Candida: Dazzling white. Bright, glowing white. Derived from the feminine of the Latin adjective meaning white. Famous bearer: George Bernard Shaw's 1898 |
| Caniad | A Welsh word meaning a melody. |
| Cant | To speak with hypocritical piety. |
| Caradawg | Legendary father of Eudav. |
| Caradog | Variant of Caradoc: Affection; amiable. |
| Caraf | A variant meaning beloved friend. |
| Caron | A Welsh name meaning to love. |
| Carwyn | Means 'blessed love' from Welsh caru 'love' and gwyn 'white, fair, blessed'. |
| Carys | Carys is a Welsh name meaning 'love' or 'beloved', derived from the word 'car' meaning 'dear one'. |
| Cas | Legendary son of Seidi. |
| Casnar | Legendary nobleman. |
| Casswallawn | Legendary son of Beli. |
| Caswallon | Legendary son of Beli. |
| Catrin | A name meaning pure one. |
| Cawrdav | Legendary son of Caradawg. |
| Ccri | A creative and inspired thinker. |
| Cedrick | Variant of Cedric: War leader; gift of splendor. |
| Cedrik | Gift of splendor. |
| Ceinwen | Beautiful gems. |
| Ceithin | Legendary uncle of Lugh. |
| Ceredig | Variant of Cerdic: Cherished. |
| Ceretic | Variant of Cerdic: Cherished. |
| Ceridwen | From 'cerdd' meaning poetry and 'gwen' meaning fair or white. Famous bearer: Ceridwen, the Welsh goddess of poetic inspiration. |
| Cerys | Variant of Carys: Love. |
| Chanda | Dignified.; An enemy of evil; Fierce.; Moon; Variant of Chand: Shining Moon. |
| Chandni | Moon light; Moonlit |
| Chandrika | Moonlight or moonbeam |
| Charlotte | Form of Charles, meaning 'a small, strong woman'; Feminine; Feminine variant of Charles meaning manly; Glam; Little and Womanly; Tiny and feminine. Also feminine of Charles meaning manly |
| Charmaine | Bountiful Orchard; Form Of Carmen; Little song; Song; Variant of Charles Manly. One of Cleopatra's attendants in Shakespeare's Antony and Cleopatra was named Charmian. |