| Name | Meaning | Gender | Origin |
|---|
| Igloo | Dome shaped Eskimo house made of blocks of snow. | Unisex | English |
| Ireland | Land of Ériu | Unisex | English |
| Jack | God is gracious | Male | Hebrew |
| Jackson | Jack's son | Male | English |
| Jagger | Pedlar | Male | English |
| Jake | Supplanted | Male | Hebrew |
| Jester | A fool at medieval courts | Unisex | English |
| Jordan | Descend | Male | Hebrew |
| Jove | Zeus, Father | Male | Roman |
| Juan | God is gracious | Male | Hebrew |
| Kishi | Beach, seashore | Unisex | Japanese |
| Klaus | Victory of the people | Male | Greek |
| Klondike | | Unisex | Hebrew |
| Koda | The allies | Unisex | Native American |
| Kodiak | Island | Unisex | Russian |
| Lady | Lady | Unisex | English |
| Lakota | Friend | Unisex | English |
| Lightning | | Unisex | Hebrew |
| Lucky | Fortunate | Unisex | English |
| Luigi | Fame + war | Male | Germanic |
| Magic | Possessing qualities that produce baffling effects | Unisex | English |
| Marshmallow | A soft spongy sweet confectionery. Also a timid person. | Unisex | English |
| Max | Little Maximus | Male | Latin |
| Maximus | The greatest | Male | Latin |
| Mickey | Who is like God? | Unisex | Hebrew |
| Miko | Crimson truth | Male | Japanese |
| Milky | | Unisex | Hebrew |
| Mini | Something smaller than others of its type | Unisex | English |
| Mo | Moor | Unisex | Latin |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |