| Name | Meaning | Gender | Origin |
|---|
| Jillian | Jove's child. Variant of Gillian from the masculine Julian.
| Female | Phonetic |
| Jo | Variation of Johanna, God is gracious | Female | English |
| Joanna | after the character in The Rescuers Down Under cartoon | Female | English |
| Josh | God Saves | Unisex | English |
| Josie | From Josephine - She shall add. | Female | English |
| Judy | Hebrew, He will be praised, woman from Judea | Female | English |
| Julia | Youthful
| Female | Latin |
| Julie | Youthful: Jove's child. A feminine of Julian.
| Female | |
| June | 6Th Month | Female | English |
| Justine | just, true | Female | |
| 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 |
| Kathleen | Innocent
| Female | Anglicized |
| Kaya | my elder sister | Female | Native |
| Kel | | Unisex | Hebrew |
| Kelsey | Ceol's island, beautiful island; from the ship's island, shipping harbor | Female | English |
| Kenan | possession | Unisex | |
| Klara | Clear, Bright | Unisex | Scandinavian |
| Kristen | Anointed, Follower Of Christ | Female | Danish |
| Kym | Royal Meadow | Unisex | English |
| Laura | bay laurel | Female | Latin |
| Laurel | Laurel
| Female | Latin |
| Lauren | bay laurel | Female | English |
| Lea | weary or meadow | Female | English |
| Leigh | meadow | Female | English |