| Name | Meaning | Gender | Origin |
|---|
| Irving | handsome, fair | Male | Scottish |
| Isis | throne | Female | Egyptian |
| Jafar | little stream | Unisex | |
| Jed | the hand | Male | English |
| John | God is merciful | Male | Hebrew |
| Jordan | The descending river, to flow | Male | Hebrew |
| Jordana | Down flowing. The river in Palestine where Jesus was baptized has been used as a given name since the Crusades.
| Female | Hebrew |
| Jori | Descending
| Male | |
| Kelby | Dark: dark-haired.
| Male | English |
| Kelvin | name of a river; from the narrow river | Male | Scottish |
| Kendall | ruler of the valley | Female | English |
| Kerry | dark, dark-haired | Male | Irish |
| Keyara | Beautiful river.
| Female | |
| Kura | Treasure House | Unisex | Japanese |
| Kyle | A place-name referring to the narrows: a wood or a church.
| Male | Scottish |
| Kym | Royal Meadow | Unisex | English |
| Lachlan | From the land of lakes.
| Male | Scottish |
| Lea | weary or meadow | Female | English |
| Lennox | amid the lems, from the field of elm trees | Male | Scottish |
| Lincoln | Capital of Nebraska, USA. Old English: home by the pond | Male | English |
| Lindsay | pool island; linden island | Female | English |
| Livingston | dear friend's place | Male | English |
| Locke | after the philosopher John Locke | Male | English |
| Lorelei | from the Rhine River | Female | |
| Lyle | island | Male | Scottish |