| Name | Meaning | Gender | Origin |
|---|
| Isra | Nocturnal journey | Unisex | Arabic |
| Ivory | Ivory | Female | English |
| Ivy | Ivy | Female | English |
| Jamie | Supplanter | Unisex | Hebrew |
| Jetta | Jet-black gemstone | Female | English |
| Jezebel | Chaste, unmarried | Female | Hebrew |
| Jinx | Magic charm | Female | Latin |
| Kamaria | Bright as the moon, like the moon | Female | Swahili |
| Kanika | Dark cloth | Female | African |
| Kara | Friend | Female | Gaelic |
| Karyan | The Dark One | Female | Armenian |
| Keara | Dark | Female | Gaelic |
| Keira | Dark | Female | Gaelic |
| Kera | Dark | Female | Gaelic |
| Keri | Country of the children of Ciar | Female | Gaelic |
| Kerri | Country of the children of Ciar | Female | Gaelic |
| Kerry | Country of the children of Ciar | Female | Gaelic |
| Kiara | Clear | Female | Latin |
| Kiarra | Small, Dark | Female | Celtic |
| Kiera | Dark | Female | Gaelic |
| Kierra | Dark | Female | Gaelic |
| Kira | Dark | Female | Gaelic |
| Kishi | Beach, seashore | Unisex | Japanese |
| Koko | The second child | Female | African |
| Kona | World rule | Unisex | Gaelic |
| Kyra | Lady | Female | Greek |
| Laila | Dark beauty | Female | Arabic |
| Laurie | Laurel | Female | Latin |
| Lela | Dark-haired beauty | Female | Persian |
| Lindsay | Uncertain, perhaps dark lake | Female | Gaelic |