| Name | Meaning | Gender | Origin |
|---|
| Jefferson | God's peace | Male | Germanic |
| Jenny | White | Female | Cornish |
| Jess | Variant Of Jesse Jehovah Exists. | Unisex | Literary |
| Jester | A fool at medieval courts | Unisex | English |
| Jethro | Pre-eminence | Male | Hebrew |
| Joe | He will enlarge | Male | Hebrew |
| Jordan | Descend | Male | Hebrew |
| June | The sixth month of the year | Female | English |
| Kaiser | Emperor: Variant Of Caesar. | Male | Latin |
| Kane | A spear | Female | Hebrew |
| Kara | Friend | Female | Gaelic |
| Kennedy | Armored head | Male | Gaelic |
| Kenya | The country of Kenya | Female | English |
| Kirby | Church settlement | Female | Norse |
| Knut | Knot | Male | Norse |
| Kobi | Supplanter | Unisex | Hebrew |
| Kody | Descendant of Cuidighthigh | Male | Gaelic |
| Kona | World rule | Unisex | Gaelic |
| Kujo | | Unisex | Hebrew |
| Laddie | Young Attendant | Male | English |
| Lana | Rock | Female | Gaelic |
| Lane | Lane | Unisex | English |
| Lee | Clearing, meadow | Female | English |
| Leo | Lion | Male | Latin |
| Lex | Defending men | Unisex | Greek |
| Liberty | Freedom | Female | Latin |
| Lillie | Lily | Female | English |
| Lindsay | Uncertain, perhaps dark lake | Female | Gaelic |
| Linus | Flaxen-Haired | Male | Greek |
| Lizzie | My God is a vow | Unisex | Hebrew |