| Name | Meaning | Gender | Origin |
|---|
| Jennifer | white shadow, white wave | Female | Cornish |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jerk | Ever Powerful Ruler | Unisex | Swedish |
| Jessica | God's grace | Female | Hebrew |
| Jessy | God's Gracious Gift | Unisex | Hebrew |
| Jojo | | Female | Hebrew |
| Julia | Youthful
| Female | Latin |
| Juliette | youthful | Female | |
| Justine | just, true | Female | |
| Karin | Pure | Unisex | Greek |
| Kate | Pure | Female | English |
| Katherine | Pure. Used since third century A.D. Early Latin forms Katerina and Caterina became Katharine and Catherine. French Cateline and English Catlyn came into wider use during medieval period when variants multiplied.
| Female | Greek |
| Katja | Pure.
| Female | |
| Kelly | Lively: aggressive.
| Female | Irish |
| Kip | From The Pointed Hill | Unisex | English |
| Konrad | Bold, Wise Councelor | Unisex | German |
| Kunz | Honest Advisor | Unisex | German |
| Lara | citadel | Female | Russian |
| Larissa | name of a city, mythical woman; cheerful one | Female | Ltin |
| Laura | bay laurel | Female | Latin |
| Lea | weary or meadow | Female | English |
| Lena | Alluring, Temptress, Light | Female | Greek |
| Lina | tender | Unisex | |
| Linn | Beautiful | Unisex | English |