| Cassidy | - | Irish Name | Cassie | - | English Name |
| Cassiel | - | Latin Name | Cassielle | - | Latin Name |
| Cassiopeia | - | Greek Name | Cassius | - | French Name |
| Caster | - | English Name | Castiel | - | Hebrew Name |
| Cat | - | Scottish Name | Catalena | - | Spanish Name |
| Catalia | - | Spanish Name | Catalin | - | Basque Name |
| Catalina | - | Romanian Name | Catalyna | - | Spanish Name |
| Catarina | - | Italian Name | Catava | - | African Name |
| Cate | - | Anglo Name | Catelyn | - | Irish Name |
| Caterina | - | Chinese Name | Cathair | - | Scottish Name |
| Cathalina | - | Swedish Name | Cathan | - | Irish Name |
| Catharina | - | Greek Name | Catharine | - | Greek Name |
| Cathasach | - | Gaelic Name | Catherine | - | Anglo Name |
| Catheryn | - | Anglo Name | Cathleen | - | American Name |
| Cathmor | - | Gaelic Name | Cathrine | - | English Name |
| Cathryn | - | Anglo Name | Cathy | - | American Name |
| Catia | - | Finnish Name | Catie | - | Australian Name |
| Cato | - | Latin Name | Catori | - | American Name |
| Catrina | - | American Name | Catriona | - | Gaelic Name |
| Catterick | - | Arthurian Name | Cauley | - | Scottish Name |
| Caulton | - | English Name | Cauvery | - | Hindu Name |
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