| Name | Meaning | Gender | Origin |
|---|
| Jordan | The descending river, to flow | Male | Hebrew |
| Jupiter | Zeus, Father | Male | Roman |
| Kai | Fire
| Male | Hawaiian |
| Kelby | Dark: dark-haired.
| Male | English |
| Kelvin | name of a river; from the narrow river | Male | Scottish |
| Kerry | dark, dark-haired | Male | Irish |
| Kim | chief | Male | English |
| Kingston | From the king's village or estate King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kipling | after Rudyard Kipling, writer | Unisex | |
| Kipp | wearing a crown, sharply pointed hill | Male | English |
| Kirby | church settlement | Male | Norse |
| Kirkwood | From The Church's Forest | Unisex | English |
| Krishna | dark, black | Male | Sanskrit |
| Kyle | A place-name referring to the narrows: a wood or a church.
| Male | Scottish |
| Lachlan | From the land of lakes.
| Male | Scottish |
| Lacy | Derived from Lacey which is a French Nobleman's surname brought to British Isles after Norman conquest.
| Male | |
| Lamar | land | Male | English |
| Lambert | Light of land
| Male | |
| Lance | knight's attendant; land | Male | English |
| Land | | Male | Hebrew |
| Lane | narrow road | Male | English |
| Langley | Residence Name | Male | English |
| Langston | Town Of The Giant | Male | English |
| Lathrop | From The Barn Farmstead | Unisex | English |
| Leaf | | Male | |