| Jaegar | Man | German Names |
| Jaeger | Man | German Names |
| Jessen | Man | German Names |
| Johan | Man | German Names |
| Johann | Man | German Names |
| Johanna | Woman | German Names |
| Josef | Man | German Names |
| Jung | Unisex | German Names |
| Kaiser | Man | German Names |
| Karl | Man | German Names |
| Karla | Woman | German Names |
| Karsten | Unisex | German Names |
| Kaspar | Man | German Names |
| Kathan | Man | German Names |
| Katinka | Woman | German Names |
| Katrina | Woman | German Names |
| Katz | Unisex | German Names |
| Keefer | Man | German Names |
| Keller | Unisex | German Names |
| Kern | Unisex | German Names |