| Name | Meaning | Gender | Origin |
|---|
| Jordan | The descending river, to flow | Male | Hebrew |
| Joris | Dutch for George | Unisex | |
| Joseph | God will increase | Male | Hebrew |
| Josephine | God will increase | Female | |
| Jovian | | Unisex | Hebrew |
| Joy | From Joyce - Gay and joyful | Female | Word |
| Joyce | after James Augustine Aloysius Joyce, Irish writer and poet | Female | Latin |
| Julia | Youthful
| Female | Latin |
| Julian | Jove's child. Form of Julius and family clan name of several powerful Roman emperors. Biblical Roman centurion Julius saved Paul's life during a hazardous voyage
| Male | English |
| Julie | Youthful: Jove's child. A feminine of Julian.
| Female | |
| Juliette | youthful | Female | |
| Julius | after Julius Caesar | Male | Latin |
| June | 6Th Month | Female | English |
| Jurgen | German form of George
| Male | |
| Justa | Just, Fairness | Unisex | Latin |
| Justin | just, true | Male | Latin |
| Justus | Just | Male | Roman |
| Karen | pure | Female | Danish |
| Kasimir | Famous, Great Destroyer | Unisex | Slavic |
| Kevin | handsome | Male | Irish |
| Killian | church | Male | Irish |
| Konrad | Bold, Wise Councelor | Unisex | German |
| Kristopher | Greek and Latin, bearer of Christ | Male | Greek |
| Lacy | Derived from Lacey which is a French Nobleman's surname brought to British Isles after Norman conquest.
| Male | |
| Lambert | Light of land
| Male | |