| Name | Meaning | Gender | Origin |
|---|
| Indiana | Land of Indians | Unisex | English |
| Ira | Watchful | Female | Hebrew |
| Jaws | Bones that form the mouth. A dangerous situation - "The Jaws of Death" | Unisex | English |
| Jess | Variant Of Jesse Jehovah Exists. | Unisex | Literary |
| Jet | Black gemstone | Unisex | English |
| Jezebel | Chaste, unmarried | Female | Hebrew |
| Juniper | Juniper bush | Female | Latin |
| Justice | Righteous | Unisex | Latin |
| Jynx | Charm, Spell | Unisex | Latin |
| Kahlua | | Unisex | Hebrew |
| Kane | A spear | Female | Hebrew |
| Kassie | Abbreviation Of Cassandra. Unheeded Prophetess. In Homer's The Iliad Cassandra's Prediction Of The Fall Of Troy Was Unheeded. | Female | English |
| Kenya | The country of Kenya | Female | English |
| Killer | | Unisex | Hebrew |
| Klingon | | Unisex | Hebrew |
| Koda | The allies | Unisex | Native American |
| Kodiak | Island | Unisex | Russian |
| Kojak | | Unisex | Hebrew |
| Lex | Defending men | Unisex | Greek |
| Liberty | Freedom | Female | Latin |
| Lightening | | Unisex | Hebrew |
| Lilly | Lily | Female | English |
| Lucky | Fortunate | Unisex | English |
| Luna | Moon | Female | Latin |
| Maddox | Good | Unisex | Welsh |
| Magnum | A large type of wine bottle. | Unisex | English |
| Marley | Pleasant wood | Female | English |
| Maverick | Dissenter | Unisex | English |
| Maxima | The greatest | Female | Latin |
| Maya | Uncertain, perhaps mother or great one | Female | Greek |