| Name | Meaning | Gender | Origin |
|---|
| Jewel | Jewel
| Female | Word |
| Jezzamyn | | Unisex | Hebrew |
| Jimena | Heard
| Female | Spanish |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| Johnston | From John's farm
| Male | |
| Johny | | Male | |
| Jojo | | Female | Hebrew |
| Jorge | Spanish form of George farmer
| Male | Spanish |
| Jori | Descending
| Male | |
| Josefina | God Will Increase | Unisex | Spanish |
| Joy | From Joyce - Gay and joyful | Female | Word |
| Juice Box | | Unisex | Hebrew |
| 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 |
| Junebug | | Female | Hebrew |
| Kali | after the Indian goddess of death | Female | Sanskrit |
| Kam | Form of Cameron crooked nose.
| Male | |
| Kamen | Rock | Unisex | Croatian |
| Kareem | noble, distinguished | Male | Arabic |
| Kareena | Pure, innocent, female friend
| Female | |
| Kashmire | | Male | Hebrew |
| 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 |
| Katie Bell | Gryffindor chaser.
| Female | |
| Katmandu | | Male | Hebrew |