| Name | Meaning | Gender | Origin |
|---|
| Indigo | A dark blue plant dye | Female | Greek |
| Ivy | ivy plant, a wine | Female | Plant |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jack | From John - God's gracious gift | Male | English |
| Jada | wise | Female | Spanish |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jet | A deep black colour. Aircraft engine that propels an aircraft forward by expelling exhaust gases toward the rear. | Male | Mineral |
| Juniper | Juniper Tree | Female | English |
| Keziah | cassia tree | Female | Hebrew |
| Kura | Treasure House | Unisex | Japanese |
| Laurel | Laurel
| Female | Latin |
| Lavender | Lavender, A Purple Flower | Female | English |
| Leaf | | Male | |
| Legolas | Tolkien, Lord of the Rings | Unisex | |
| Leif | heir, descendant | Male | Scandinavian |
| Lennox | amid the lems, from the field of elm trees | Male | Scottish |
| Libra | scales, balance | Female | Greek |
| Lily | Lily
| Female | English |
| Lugh | Luminescent | Unisex | Irish |
| Mabel | my fair maid; lovely | Female | English |
| Magnolia | Flower
| Female | Latin |
| Maine | Mainland | Female | French |