| Name | Meaning | Gender | Origin |
|---|
| Jackson | Son of Jack | Male | English |
| Jackson Brown | | Unisex | Hebrew |
| Jager | Carter | Unisex | English |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| Java | Brewed coffee | Female | Anglicization |
| Jersey | From A Section Of England | Male | English |
| Jess | Gift | Male | English |
| Jessie | wealthy | Female | Anglicized |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joy | From Joyce - Gay and joyful | Female | Word |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Kahlua | | Unisex | |
| Kit | Nickname for Christopher. Frontiersman Kit Carson.
| Male | English |
| Kit Kat | | Unisex | |
| Kit Kat | | Unisex | |
| Knight | Noble, Soldier | Male | English |
| Koda | | Male | |
| Kodiak | Large Alaskan brown bear. | Female | Russian |
| Kona | Dark rich coffee blend from Hawaii. | Unisex | |
| Lacy | Derived from Lacey which is a French Nobleman's surname brought to British Isles after Norman conquest.
| Male | |
| Lady | A female title of nobility. | Female | |
| Latte | Expresso coffee mixed with steamed milk - a caf latte. | Male | |
| Laura | bay laurel | Female | Latin |
| Leroy | The king.
| Male | |