| Name | Meaning | Gender | Origin |
|---|
| Jady | The Gemstone Jade; The Color Green. | Unisex | English |
| Jane | gracious, merciful, God is gracious | Female | English |
| Janie | Jehovah Has Been Gracious; Has Shown Favor. Variant Of Joan. | Unisex | English |
| Jen | White, Fair | Unisex | English |
| Jenna | white shadow, white wave | Female | English |
| Jennifer | white shadow, white wave | Female | Cornish |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jillian | Jove's child. Variant of Gillian from the masculine Julian.
| Female | Phonetic |
| Jilly | Downy Haired | Unisex | English |
| Jodie | From Judith - Admired and praised | Unisex | |
| Joli | Cheerful; Pretty. | Unisex | English |
| Jr. | | Unisex | Hebrew |
| Justine | just, true | Female | |
| K.C. | Kitchen Cat | Unisex | |
| Kacee | Cathasaigh's Heir | Unisex | English |
| Kaci | Cathasaigh's Heir | Unisex | English |
| Kadi | Rhyming Variant Of Katy Or Cady. | Unisex | English |
| Kady | first | Female | Irish |
| Kalila | beloved | Female | Arabic |
| Kally | Modern Variant Of Callie. | Unisex | English |
| Kalyn | Slender | Unisex | English |
| Karisma | Favor; Gift;Carisma. | Unisex | English |
| Katelyn | pure | Female | Spelling |
| 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 |