| Kaan | Kacper | Kadir |
| Kai | Kaï | Kaïn |
| Kais | Kaïs | Kaj |
| Kaleb | Kalim | Kalvin |
| Kalyan | Kamal | Kameron |
| Kamiel | Kamil | Kamuran |
| Kane | Karam | Karan |
| Karel | Karim | Karl |
| Karol | Karsten | Kas |
| Kasper | Kay | Kayden |
| Kaylan | Kaylen | Kayne |
| Kayra | Kéan | Kean |
| Keanan | Keandro | Keane |
| Keano | Keanu | Keegan |
| Keith | Kelian | Kelvin |
| Kelyan | Kélyan | Kemal |
| Ken | Kenai | Kenaï |
| Kenan | Kenay | Kenji |
| Kenjy | Kenneth | Kenny |
| Keno | Kento | Kenzo |
| Keo | Keoni | Keran |
| Kerem | Kerim | Kerry |
| Kevin | Kévin | Keyano |
| Keylan | Keylian | Khaled |
| Khalid | Khalil | Kian |
| Kiandro | Kiani | Kiano |
| Kiany | Kiaro | Kieran |
| Kiéro | Kilian | Killian |
| Killyan | Kilyan | Kim |
| Kimi | Kinaï | Kingsley |
| Kiran | Kiyan | Kjell |
| Kjelle | Kjento | Klaas |
| Klajdi | Kobe | Koby |
| Koen | Koenraad | Konrad |
| Konstantin | Konstantinos | Kor |
| Koray | Korneel | Kosuke |
| Krieke | Kris | Krish |
| Kristof | Krys | Krystian |
| Kuba | Kuno | Kurt |
| Kurtis | Kwint | Kwinten |
| Kyan | Kyandro | Kyani |
| Kyann | Kyano | Kyaro |
| Kyento | Kyenzo | Kylan |
| Kyle | Kylian | Kyliann |
| Kyliano | Kyllian | Kylyan |
| Kynai | Kynan | Kyran |
| Kyrian | Kythano |