| Name | Meaning | Gender | Origin |
|---|
| Jess | Variant Of Jesse Jehovah Exists. | Unisex | Literary |
| Jester | A fool at medieval courts | Unisex | English |
| Jet | Black gemstone | Unisex | English |
| Jewels | Down-bearded youth | Unisex | Latin |
| Jingles | | Unisex | Hebrew |
| Jj | | Unisex | Hebrew |
| Jojo | Monday born | Unisex | African |
| Justice | Righteous | Unisex | Latin |
| Kc | | Unisex | Hebrew |
| Kelsey | Cenel's land | Unisex | English |
| Kipper | A pointed hill | Unisex | English |
| Kiwi | | Unisex | Hebrew |
| Koda | The allies | Unisex | Native American |
| Kona | World rule | Unisex | Gaelic |
| Kujo | | Unisex | Hebrew |
| Lady | Lady | Unisex | English |
| Latte | Expresso coffee mixed with steamed milk - a caf latte. | Unisex | English |
| Lightning | | Unisex | Hebrew |
| Lizzy | My God is a vow | Unisex | Hebrew |
| Logan | Hollow | Unisex | Gaelic |
| Lucky | Fortunate | Unisex | English |
| Maddie | Pet form of Mad- names | Unisex | English |
| Madison | Son of Maud | Unisex | English |
| Magic | Possessing qualities that produce baffling effects | Unisex | English |
| Mango | After the character in Saturday Night Live | Unisex | English |
| Marble | | Unisex | Hebrew |
| Maverick | Dissenter | Unisex | English |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Mikey | Who is like God? | Unisex | Hebrew |