| Kogon | Japanese name, means 'small, strong, and brave' |
| Kohlman | A person who sells charcoal. |
| Koichi | Japanese name, means 'small, strong, and brave' |
| Koit | The first light of the dawn. |
| Kolbe | German name, means 'coal' or 'charcoal' |
| Kolleen | A young and lovely maiden. |
| Konradij | A bold and wise royal advisor. |
| Konradin | A brave and daring young ruler. |
| Koop | A merchant or a skilled trader. |
| Korben | Transferred use of the English surname |
| Korbob | A strong and resilient leader. |
| Kordelia | Derived from the Celtic word for jewel. |
| Kordula | Derived from the Latin word for heart. |
| Korinthian | One who hails from the city Corinth. |
| Korrie | A name meaning from the hollow place. |
| Kortnee | A form of courtney |
| Kortni | A form of courtney |
| Kostandin | Slavic name, means 'constant' or 'steadfast' |
| Kostyantyn | Slavic name, means 'constant' or 'steadfast' |
| Kouichi | The first son of happiness. |
| Kouki | Japanese name, means 'small, strong, and brave' |
| Kousuke | One who is helpful and kind. |
| Kowen | Welsh name, means 'young warrior' |
| Krasimir | Bulgarian name meaning 'glorious ruler' or 'royal glory' |
| Kreed | English name meaning 'faith' or 'creed' |
| Krisdapor | Christ, to bear |
| Kristinn | Consecrated to god |
| Kristofferson | Christ, to bear |
| Krisztofer | Christ, to bear |
| Kruise | To travel or move smoothly. |
| Kruse | Germanic name meaning 'curly-haired' or 'strong' |
| Kruz | Cross, crucifix |
| Kruze | One who crosses or travels paths. |
| Krystall | Derived from the clear ice crystal. |
| Krystelle | An icelike or clear gemstone name. |
| Krysty | A name meaning a Christian follower. |
| Kseniya | Woman of hospitality |
| Kubwa | Swahili name meaning 'big' or 'large' |
| Kuepper | A person who makes copper items. |
| Kumanosuke | Japanese name meaning 'strong and brave' |