| Name | Meaning | Gender | Origin |
|---|
| Julianne | Down-bearded youth | Female | Latin |
| Julie | Down-bearded youth | Female | Latin |
| Julien | Down-bearded youth | Male | Latin |
| Juliet | Down-bearded youth | Female | Latin |
| Juliette | Down-bearded youth | Female | Latin |
| Julius | Down-bearded youth | Male | Latin |
| June | The sixth month of the year | Female | English |
| Junior | Younger | Male | English |
| Kaiyo | Generation child | Female | Japanese |
| Kameko | Tortoise child | Female | Japanese |
| Kapera | | Female | Hebrew |
| Kaya | Pure | Female | Greek |
| Kayin | Widely recognized | Male | African |
| Kayla | Who is like God? | Female | Hebrew |
| Keiki | Child, offspring, descendant | Female | Hawaiian |
| Keiko | Blessed child | Female | Japanese |
| Kelby | Child's town | Male | English |
| Kenda | Valley of the River Kent | Female | Gaelic |
| Keri | Country of the children of Ciar | Female | Gaelic |
| Kern | Seed | Male | German |
| Kerri | Country of the children of Ciar | Female | Gaelic |
| Kerry | Country of the children of Ciar | Female | Gaelic |
| Kester | From The Roman Camp | Male | English |
| Keven | Handsome Child. Variant Of Kevin. | Male | English |
| Kevin | Beautiful at birth | Male | Gaelic |
| Kevina | Beautiful at birth | Female | Gaelic |
| Kevon | Handsome Child. Variant Of Kevin. | Male | English |
| Kioko | Joyful child | Female | Japanese |
| Kit | Bearer of Christ | Unisex | Greek |
| Kiyoshi | Quiet | Male | Japanese |