| Kyller | From the narrow channel |
| Kyo | Silent, quiet, or still |
| Kyosuke | Generous, prosperous, or good luck |
| Kyril | A noble and lordly ruler. |
| Kaan | A ruler or a powerful king. |
| Kaar | One who is a skilled worker. |
| Kaelo | A person who is very humble. |
| Kafra | A name meaning a village girl. |
| Kaikoa | A brave warrior of the sea. |
| Kailua | Two seas meeting together. |
| Kair | A name meaning peaceful or quiet. |
| Kakashi | Japanese name meaning scarecrow. |
| Kaladin | A name meaning born of light. |
| Kallus | A name meaning bud or sprout. |
| Kamalani | A name meaning heavenly child. |
| Kamehameha | The lonely one or the set apart. |
| Kaminari | A Japanese name meaning thunder. |
| Kamose | A name meaning the soul of Ra. |
| Kandinsky | One from the Kandy region |
| Kart | A small vehicle for transport |
| Katu | A person who is very sharp |
| Kaze | A name meaning wind or breeze. |
| Keaka | The Hawaiian form of the name Jack. |
| Kelsier | A fictional hero of the mistborn. |
| Kenickie | A name of English origin meaning kin. |
| Keokuk | A name meaning the watchful fox. |
| Kerala | A land filled with coconut trees. |
| Kernel | The core or central part of a seed. |
| Kerouac | A name of Gaelic origin meaning dark. |
| Khafre | An ancient Egyptian name for a king. |
| Khag | A Sanskrit name meaning a bird. |
| Khagpal | A protector of the flying birds. |
| Khajur | The sweet fruit of a date palm. |
| Khensu | An ancient Egyptian moon deity. |
| Khonsu | The god of the moon and time. |
| Khurana | One who is a noble or wise person. |
| Kief | A state of peaceful relaxation. |
| Kiian | An ancient and noble descendant. |
| Killua | One who is a deadly assassin. |
| Kings | A name meaning a male sovereign or ruler. |