| Name | Meaning | Gender | Origin |
|---|
| Jazz | The romantic music | Unisex | English |
| Jester | A fool at medieval courts | Unisex | English |
| Jewels | Down-bearded youth | Unisex | Latin |
| Juju | | Unisex | Hebrew |
| Jupiter | Father god | Unisex | Latin |
| Justice | Righteous | Unisex | Latin |
| Kasper | Treasurer | Unisex | Persian |
| Kelsey | Cenel's land | Unisex | English |
| Kisses | One who likes to kiss | Unisex | English |
| Koda | The allies | Unisex | Native American |
| Korbel | | Unisex | Hebrew |
| Kujo | | Unisex | Hebrew |
| Kuma | Bear (Japanese). Also to call - kuma (come) here. | Unisex | English |
| Lakota | Friend | Unisex | English |
| Lemon | Beloved man | Unisex | English |
| Lestat | | Unisex | Hebrew |
| Lexy | Defending men | Unisex | Greek |
| Luca | Man from Lucania | Unisex | Greek |
| Lucky | Fortunate | Unisex | English |
| Madison | Son of Maud | Unisex | English |
| Magic | Possessing qualities that produce baffling effects | Unisex | English |
| Magnum | A large type of wine bottle. | Unisex | English |
| Majestic | | Unisex | Hebrew |
| Mango | After the character in Saturday Night Live | Unisex | English |
| Maxie | Pet form of names starting with Max | Unisex | English |
| Maxx | Greatest | 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 |
| Mocha | Coffee of high quality. | Unisex | English |