| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 561 | Joss | German | Diminutive of Jocelyn: One of the Goths'. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century. | M | |
| 562 | Jurgen | German | German form of George. | M | |
| 563 | Kaiser | German | emperor; variant of Caesar. | M | |
| 564 | Karl | German | Variant of the Germanic form of Charles, meaning a man. | M | |
| 565 | Karlee | German | Womanly; strength. Feminine of Karl. | M | |
| 566 | Karlyn | German | Womanly; strength. Feminine of Karl. | M | |
| 567 | Katrina | German | Variant of Katherine. Pure. | M | |
| 568 | Keefer | German | Barrelmaker Variant of Cooper. Surname. | M | |
| 569 | Keifer | German | Barrelmaker Variant of Cooper. Surname. | M | |
| 570 | Kelby | German | Dark; dark-haired. | M | |
| 571 | Kiefer | German | Barrelmaker Variant of Cooper. Surname. | M | |
| 572 | Klaus | German | German form of Nicholas. | M | |
| 573 | Koby | German | Dark; dark-haired. | M | |
| 574 | Koen | German | Honest advisor. | M | |
| 575 | Koenraad | German | Honest advisor. | M | |
| 576 | Kolby | German | Dark; dark-haired. | M | |
| 577 | Kolt | German | Coal town. | M | |
| 578 | Kolten | German | Coal town. | M | |
| 579 | Koltin | German | Coal town. | M | |
| 580 | Kolton | German | Coal town. | M | |