| Name | Group | Language of Origin | Languages of Use | Meaning/Translation or Related Words | US 2024 |
| Juul | Julius/Julia | Latin | Dutch | Words: dedicated to Jupiter | |
| Kaiser | Cäsar/Cesira | Latin | English | Words: cut, excise | #797 |
| Kajetan | Kajetan/Kajetana | Latin | German | from Caieta | |
| Kajetana | Kajetan/Kajetana | Latin | German, Slavic | from Caieta | |
| Kajetonas | Kajetan/Kajetana | Latin | Lithuanian | from Caieta | |
| Kajus | Kajetan/Kajetana | Latin | Lithuanian | from Caieta | |
| Kamil | Camillo/Camilla | Latin | Polish | maybe acolyte | |
| Kamila | Camillo/Camilla | Latin | Czech, Polish | maybe acolyte | #292 |
| Kamilah | Camillo/Camilla | Latin | English | maybe acolyte | |
| Kamile | Camillo/Camilla | Latin | Lithuanian | maybe acolyte | |
| Kamilla | Camillo/Camilla | Latin | German | maybe acolyte | |
| Kamille | Camillo/Camilla | Latin | English | maybe acolyte | |
| Kamillo | Camillo/Camilla | Latin | German | maybe acolyte | |
| Kamillus | Camillo/Camilla | Latin | German | maybe acolyte | |
| Kamilly | Camillo/Camilla | Latin | Portuguese | maybe acolyte | |
| Kandida | Candido/Candida | Latin | German | white | |
| Kandidus | Candido/Candida | Latin | German | white | |
| Karita | Caritas | Latin | Scandinavian | Words: charity | |
| Karitas | Caritas | Latin | Icelandic | Words: charity | |
| Karítas | Caritas | Latin | Icelandic | Words: charity | |
| Karsta | Christian/Christine | Latin | German, Low German | Christian, disciple of Christ | |
| Karsten | Christian/Christine | Latin | German, Low German | Christian, disciple of Christ | |
| Kassie | Cassius/Cassia | Latin | English | Words: empty, vain | |
| Kassius | Cassius/Cassia | Latin | German | Words: empty, vain | |
| Kelemen | Clement/Clemence/Clementine | Latin | Hungarian | the merciful, the gentle | |
| Kersten | Christian/Christine | Latin | German, Low German | Christian, disciple of Christ | |
| Kerstin | Christian/Christine | Latin | Scandinavian | Christian, disciple of Christ | |
| Kiana | Diana | Latin | Hawaii | Words: light, daylight, deity | #718 |
| Kiersten | Christian/Christine | Latin | Scandinavian, English | Christian, disciple of Christ | |
| Kirsten | Christian/Christine | Latin | German, Low German | Christian, disciple of Christ | |
| Kirsten | Christian/Christine | Latin | German, Low German, Scandinavian | Christian, disciple of Christ | |
| Kirstie | Christian/Christine | Latin | English, Scottish | Christian, disciple of Christ | |
| Kirstin | Christian/Christine | Latin | German, Scandinavian | Christian, disciple of Christ | |
| Kirsty | Christian/Christine | Latin | English, Scottish | Christian, disciple of Christ | |
| Klara | Clare | Latin | German | clear, bright | |
| Klára | Clare | Latin | Czech | clear, bright | |
| Klarina | Clare | Latin | German | clear, bright | |
| Klarinda | Clare | Latin | German | clear, bright | |
| Klarinde | Clare | Latin | German | clear, bright | |
| Klarine | Clare | Latin | German | clear, bright | |
| Klarissa | Clare | Latin | German, Latinized | clear, bright | |
| Klaudia | Claudius/Claudia | Latin | German, Hungarian | the limping | |
| Klaudija | Claudius/Claudia | Latin | Slavic | the limping | |
| Klaudius | Claudius/Claudia | Latin | German | the limping | |
| Klaudiusz | Claudius/Claudia | Latin | Polish | the limping | |
| Klemens | Clement/Clemence/Clementine | Latin | German, Scandinavian, Polish | the merciful, the gentle | |
| Klementine | Clement/Clemence/Clementine | Latin | German | the merciful, the gentle | |
| Klemenz | Clement/Clemence/Clementine | Latin | German, Scandinavian, Polish | the merciful, the gentle | |
| Kliment | Clement/Clemence/Clementine | Latin | Czech, Russian | the merciful, the gentle | |
| Kolumba | Colombe | Latin | German | dove | |
| Kolumban | Columbano | Latin | German | dove | |
| Konsta | Konstantin/Konstanze | Latin | Finnish | the steadfast | |
| Konstandin | Konstantin/Konstanze | Latin | Albanian | the steadfast | |
| Konstantin | Konstantin/Konstanze | Latin | German, Bulgarian, Hungarian, Russian | the steadfast | |
| Konstantina | Konstantin/Konstanze | Latin | German | the steadfast | |
| Konstantína | Konstantin/Konstanze | Latin | Greek | the steadfast | |
| Konstantine | Konstantin/Konstanze | Latin | German | the steadfast | |
| Konstantínos | Konstantin/Konstanze | Latin | Greek | the steadfast | |
| Konstanze | Konstantin/Konstanze | Latin | German | the steadfast | |
| Korbin | Corvin | Latin | English | Words: raven | |
| Korbyn | Corvin | Latin | English | Words: raven | |
| Kordelia | Cordula | Latin | German | | |
| Kordula | Cordula | Latin | German | | |
| Korey | Corey/Corey | Latin | English | Words: raven / ravine | |
| Kori | Corey/Corey | Latin | English | Words: raven / ravine | #893 |
| Kornel | Cornelius/Cornelia | Latin | Czech | Words: horn | |
| Kornél | Cornelius/Cornelia | Latin | Hungarian | Words: horn | |
| Kornelia | Cornelius/Cornelia | Latin | German | Words: horn | |
| Kornelius | Cornelius/Cornelia | Latin | German | Words: horn | |
| Korneliusz | Cornelius/Cornelia | Latin | Polish | Words: horn | |
| Korona | Corona | Latin | German | Words: crown, garland | |
| Kory | Corey/Corey | Latin | English | Words: raven / ravine | |
| Kosta | Konstantin/Konstanze | Latin | Greek | the steadfast | |
| Kostandin | Konstantin/Konstanze | Latin | Albanian | the steadfast | |
| Kostas | Konstantin/Konstanze | Latin | Greek | the steadfast | |
| Kostja | Konstantin/Konstanze | Latin | Russian | the steadfast | |
| Kreszentia | Crescenzio/Crescentia | Latin | German | the growing | |
| Kreszenz | Crescenzio/Crescentia | Latin | German | the growing | |
| Kris | Christian/Christine | Latin | German, English | Christian, disciple of Christ | |
| Krispin | Crispin/Crispina | Latin | German | curly haired | |
| Krista | Christian/Christine | Latin | German, Scandinavian | Christian, disciple of Christ | |
| Kristen | Christian/Christine | Latin | Scandinavian | Christian, disciple of Christ | |
| Kristers | Christian/Christine | Latin | Latvian | Christian, disciple of Christ | |
| Kristi | Christian/Christine | Latin | English | Christian, disciple of Christ | |
| Kristian | Christian/Christine | Latin | Scandinavian | Christian, disciple of Christ | |
| Kristian | Christian/Christine | Latin | English | Christian, disciple of Christ | |
| Kristie | Christian/Christine | Latin | English | Christian, disciple of Christ | |
| Kristiina | Christian/Christine | Latin | Finnish | Christian, disciple of Christ | |
| Kristijan | Christian/Christine | Latin | Slavic | Christian, disciple of Christ | |
| Kristin | Christian/Christine | Latin | Scandinavian | Christian, disciple of Christ | |
| Kristín | Christian/Christine | Latin | Icelandic | Christian, disciple of Christ | |
| Kristina | Christian/Christine | Latin | Scandinavian | Christian, disciple of Christ | |
| Kristína | Christian/Christine | Latin | Slovak | Christian, disciple of Christ | |
| Kristine | Christian/Christine | Latin | Scandinavian | Christian, disciple of Christ | |
| Kristinn | Christian/Christine | Latin | Icelandic | Christian, disciple of Christ | |
| Kristjan | Christian/Christine | Latin | Estonian | Christian, disciple of Christ | |
| Kristján | Christian/Christine | Latin | Icelandic | Christian, disciple of Christ | |
| Kristy | Christian/Christine | Latin | English | Christian, disciple of Christ | |
| Kristyn | Christian/Christine | Latin | English | Christian, disciple of Christ | |
| Kristýna | Christian/Christine | Latin | Czech | Christian, disciple of Christ | |