| Name | Meaning | Gender | Origin |
|---|
| Jasper | Black stone
| Male | Persian |
| Jay | jaybird | Male | Latin |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joe | Abbreviation of Joseph.
| Male | English |
| Jones | God Will Bring | Male | Welsh |
| Judd | praised | Male | Medieval |
| Judy | Hebrew, He will be praised, woman from Judea | Female | English |
| 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 |
| June | 6Th Month | Female | English |
| Juniper | Juniper Tree | Female | English |
| Jupiter | Zeus, Father | Male | Roman |
| Kai | Fire
| Male | Hawaiian |
| Kingston | From the king's village or estate King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kipp | wearing a crown, sharply pointed hill | Male | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Lana | Attractive | Female | English |
| Lennon | small cloak or cape | Male | Irish |
| Lenny | brave lion | Male | English |
| Leon | lion | Male | Greek |
| Leonard | lion-hearted | Male | |
| Leonora | Light | Female | Italian |
| Leopold | after Leopoldo in the movie Blood and Roses | Male | |
| Leslie | dweller in the gray castle; small meadow | Female | Scottish |