| Name | Meaning | Gender | Origin |
|---|
| Jekyl | | Male | |
| Jeremias | Exalted of the Lord
| Male | |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| Johnston | From John's farm
| Male | |
| Jordan | The descending river, to flow | Male | Hebrew |
| Jorge | Spanish form of George farmer
| Male | Spanish |
| Jupiter | Zeus, Father | Male | Roman |
| Kai | Fire
| Male | Hawaiian |
| Kawaii | | Unisex | |
| Keenan | Ancient
| Male | Irish |
| Kentuky | | Male | |
| Kidino | | Male | Hebrew |
| Kingston | From the king's village or estate King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kitler | | Male | Hebrew |
| Knickers | | Male | |
| Kreatcher | the Black's house elf
| Male | |
| Lace | From Lassy, Normandy | Unisex | English |
| Lacy | Derived from Lacey which is a French Nobleman's surname brought to British Isles after Norman conquest.
| Male | |
| Lancelot | Knight of Arthur and lover of Guinevere
| Male | |
| Leaf | | Male | |
| Leo | Lion.
| Male | Latin |
| Liam | Form of William.
| Male | Irish |
| Lil Bit | | Male | Hebrew |
| Lionel | Cousin of Lancelot
| Male | Latin |
| Littlerock | | Male | |