| Name | Meaning | Gender | Origin |
|---|
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jazzy | Modern variant of Jasmine: combination of Jocelyn and the musical term jazz.
| Female | |
| Jersey | From A Section Of England | Male | English |
| Jessica | God's grace | Female | Hebrew |
| Jezabel | | Unisex | Hebrew |
| Jimbo | Supplanter, Representative | Unisex | Hebrew |
| Jing | Pure Epitomy | Unisex | Chinese |
| Jinx | Charm, Spell | Female | Latin |
| Josh | God Saves | Unisex | English |
| Josie | From Josephine - She shall add. | Female | English |
| Kiki | From Enriqueta - Pet | Female | |
| Kiki | From Enriqueta - Pet | Female | |
| Kinky | | Unisex | |
| Kiri | tree bark | Female | Maori |
| Kitkat | | Unisex | Hebrew |
| Klara | Clear, Bright | Unisex | Scandinavian |
| Kodiak | Large Alaskan brown bear. | Female | Russian |
| Kumar | a boy, a son | Male | Sanskrit |
| Lennon | small cloak or cape | Male | Irish |
| Leo | Lion.
| Male | Latin |
| Lillie | Lily | Unisex | English |
| Lily | Lily
| Female | English |
| Loki | To Break | Male | Norse |
| Lorelei | from the Rhine River | Female | |