| Cian | - | Gaelic Name | Ciana | - | French Name |
| Cianna | - | Italian Name | Cianni | - | Italian Name |
| Ciara | - | Irish Name | Ciaran | - | Irish Name |
| Ciarda | - | Gaelic Name | Ciardubhan | - | Gaelic Name |
| Ciarra | - | Latin Name | Cicely | - | Latin Name |
| Cicily | - | English Name | Cid | - | Spanish Name |
| Ciel | - | French Name | Ciella | - | Australian Name |
| Cielo | - | Spanish Name | Cienna | - | Italian Name |
| Ciera | - | Muslim Name | Cierra | - | English Name |
| Cihuaton | - | Hungarian Name | Cili | - | Hungarian Name |
| Cilicia | - | Biblical Name | Cilla | - | Welsh Name |
| Cindy | - | Australian Name | Cinnamon | - | American Name |
| Cinnard | - | Gaelic Name | Cinneidudh | - | Gaelic Name |
| Cinnfhail | - | Gaelic Name | Cinthia | - | American Name |
| Cipactli | - | Nahuatl Name | Ciqala | - | American Name |
| Cira | - | Italian Name | Circe | - | African Name |
| Cirilla | - | Latin Name | Ciro | - | Persian Name |
| Cis | - | Biblical Name | Cisco | - | Spanish Name |
| Citlali | - | Nahuatl Name | Citlalli | - | American Name |
| Citlalmina | - | Nahuatl Name | Ckaha | - | African Name |
| Clach | - | Scottish Name | Clady | - | Danish Name |
| Claennis | - | Anglo Name | Clair | - | Latin Name |
| Claira | - | Latin Name | Claire | - | French Name |
| Clamedeus | - | Arthurian Name |
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