| Castro | Unisex | Spanish Names |
| Cat | Woman | English Names |
| Catahecassa | Man | Native American - Shawnee Names |
| Catalin | Woman | Spanish Names |
| Catalina | Woman | Spanish Names |
| Cate | Woman | English Names |
| Catelin | Woman | American Names |
| Catequil | Man | Incan Names |
| Caterina | Woman | Slavic Names |
| Cathair | Man | Irish Names |
| Cathal | Man | Irish Names |
| Cathán | Man | Irish Names |
| Catherine | Woman | Greek Names |
| Cathica | Woman | English Names |
| Cathleen | Woman | Irish Names |
| Cathy | Woman | Greek Names |
| Catlin | Woman | English Names |
| Catlyn | Woman | English Names |
| Cato | Unisex | Latin Names |
| Caton | Woman | French Names |