| Name | Meaning | Gender | Origin |
|---|
| Jessie | wealthy | Female | Anglicized |
| Jewel | Jewel
| Female | Word |
| Jillian | Jove's child. Variant of Gillian from the masculine Julian.
| Female | Phonetic |
| Jordan | The descending river, to flow | Male | Hebrew |
| Jordana | Down flowing. The river in Palestine where Jesus was baptized has been used as a given name since the Crusades.
| Female | Hebrew |
| Josephine | God will increase | Female | |
| Josie | From Josephine - She shall add. | Female | English |
| Jovi | after Jon Bon Jovi | Unisex | |
| Joy | From Joyce - Gay and joyful | Female | Word |
| June | 6Th Month | Female | English |
| Juniper | Juniper Tree | Female | English |
| Juno | queen of the heavens | Female | Latin |
| Justine | just, true | Female | |
| Kai | Fire
| Male | Hawaiian |
| Karis | Graceful.
| Female | |
| Kasia | Pure | Female | Polish |
| Kat | pure | Female | English |
| Katarina | pure | Female | Czech |
| Kate | Pure | Female | English |
| Katerina | Blessed, Pure, Holy | Unisex | Czechoslovakian |
| Katie | Variant of Katherine. Pure.
| Female | English |
| Katina | Pure, Unsullied | Unisex | Greek |
| Katja | Pure.
| Female | |
| Katy | pure | Female | Short |
| Katy | pure | Female | Short |