| Name | Meaning | Gender | Origin |
|---|
| Jadzia | Princess | Unisex | Polish |
| Jamal | beauty | Male | Arabic |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jay | jaybird | Male | Latin |
| Jen | White, Fair | Unisex | English |
| Jester | A fool at medieval courts | Unisex | |
| Jet | A deep black colour. Aircraft engine that propels an aircraft forward by expelling exhaust gases toward the rear. | Male | Mineral |
| Jett | Jet Black Gem | Male | English |
| Kala | time, black | Unisex | |
| Kalli | Energy, Black Goddess | Unisex | Hindu |
| Kane | tribute, warrior; the doubly-accomplished, golden; man, the eastern sky; beautiful | Male | Celtic |
| Kermit | free man | Male | Irish |
| Kerry | dark, dark-haired | Male | Irish |
| Khaki | Light olive brown colour | Unisex | |
| Khiewwan | | Unisex | Hebrew |
| Kim | chief | Male | English |
| Kona | Dark rich coffee blend from Hawaii. | Unisex | |
| Krishna | dark, black | Male | Sanskrit |
| Kumut | | Unisex | |
| Kura | Treasure House | Unisex | Japanese |
| Latte | Expresso coffee mixed with steamed milk - a caf latte. | Male | |
| Lela | Night | Unisex | Arabic |
| Licorice | Confection made from the licorice root. | Unisex | |