| Name | Meaning | Gender | Origin |
|---|
| Jerold | Variant of Gerald Rules by the spear.
| Male | |
| Jerrald | Variant of Gerald Rules by the spear.
| Male | |
| Jingo | | Male | |
| Jip | | Male | |
| Jitterbug | | Male | Hebrew |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joe | Abbreviation of Joseph.
| Male | English |
| Jonah | Dove. In the bible Jonah was on board a ship God caused to sink: sailors traditionally use the name Jonah to personify someone who brings bad luck.
| Male | Hebrew |
| Jonas | Dove. Variant of Hebrew Jonah.
| Male | Greek |
| Jore | God will uplift
| Male | |
| Juniper | Juniper Tree | Female | English |
| Justin | just, true | Male | Latin |
| Kafir | | Male | Hebrew |
| Kanji | | Male | Hebrew |
| Karma | Fate or destiny (Hinduism and Buddhism) | Female | Hindi |
| Keefer | Barrelmaker Variation of Cooper. Surname.
| Male | |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keets | | Male | Hebrew |
| Keifer | Barrelmaker Variation of Cooper. Surname.
| Male | |
| Kelby | Dark: dark-haired.
| Male | English |
| Khristian | Anointed, follows Christ.
| Male | |
| Kimble | | Male | |
| King | King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Klaw | | Male | Hebrew |
| Klutz | | Male | Hebrew |