| Cassie | - | United States Name | Cassiel | - | Latin Name |
| Cassielle | - | Latin Name | Cassien | - | Cyprien Name |
| Cássio | - | Portuguese Name | Cassiopeia | - | Greek Name |
| Cassius | - | French Name | Cassy | - | Maori 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 | - | Portuguese 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 | - | Maori Name |
| Catheryn | - | Anglo Name | Cathleen | - | United States Name |
| Cathmor | - | Gaelic Name | Cathrine | - | Greek Name |
| Cathryn | - | Anglo Name | Cathy | - | American Name |
| Catia | - | Finnish Name |
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