| Name | Meaning | Gender | Origin |
|---|
| John | God is merciful | Male | Hebrew |
| Johnnie | Modern feminine of John and Jon.
| Male | English |
| Johnny | the Lord is gracious | Male | English |
| Jonathan | God gives | Male | Hebrew |
| Jones | God Will Bring | Male | Welsh |
| Jordan | The descending river, to flow | Male | Hebrew |
| Journey | Journey | Female | English |
| Kai | Fire
| Male | Hawaiian |
| Kendall | ruler of the valley | Female | English |
| Kensington | | Male | Hebrew |
| Kenya | Animal Horn | Female | 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 |
| Kit | Nickname for Christopher. Frontiersman Kit Carson.
| Male | English |
| Koda | | Male | |
| Kush | son of Rama | Unisex | |
| Kyle | A place-name referring to the narrows: a wood or a church.
| Male | Scottish |
| Lemmy | after Lemmy Kilmister of Motorhead | Unisex | |
| Leon | lion | Male | Greek |
| Lewis | Renowned fighter. Form of Louis.
| Male | English |
| Lincoln | Capital of Nebraska, USA. Old English: home by the pond | Male | English |
| Lisbon | | Unisex | Hebrew |
| Lisha | Noble, Kind | Unisex | English |
| Logan | little hollow | Male | Scottish |
| Lola | strong woman | Female | Spanish |
| London | fierce ruler of the world | Female | English |