| Name | Meaning | Gender | Origin |
|---|
| Jet | Black gemstone | Unisex | English |
| Jett | Black gemstone | Male | English |
| Jock | Supplanter | Male | English |
| Johnson | God is gracious | Male | Hebrew |
| Juliet | Down-bearded youth | Female | Latin |
| Justice | Righteous | Unisex | Latin |
| Kael | Uncertain, perhaps slender | Male | Gaelic |
| Kaiden | Warrior | Male | English |
| Kane | A spear | Female | Hebrew |
| Kay | Pure | Male | Greek |
| Kayleigh | Descendant of Caollaidhe | Female | Gaelic |
| Keane | Descendant of Cathán | Male | Gaelic |
| Keith | Woods | Male | Gaelic |
| Keitha | Woods | Female | Gaelic |
| Kelley | War | Unisex | Gaelic |
| Kelli | War | Female | English |
| Kellie | War | Female | Gaelic |
| Kelly | War | Female | Gaelic |
| Kemp | Battler, fighter, warrior | Male | English |
| Kent | Uncertain, perhaps coastal region | Male | English |
| Kern | Seed | Male | German |
| Kimball | Bold Kin. | Unisex | English |
| Kimberly | Variable prefix + forest clearing | Unisex | English |
| Knox | Round-topped hill | Male | English |
| Kolya | Victorious Army | Male | English |
| Lance | Territory | Male | German |
| Lancelot | Knight Of Arthur And Lover Of Guinevere | Male | French |
| Larson | Variant Of Larsen: Son Of Lars | Unisex | English |
| Laurence | Man from Laurentum | Male | Latin |
| Lawson | Man from Laurentum | Male | Latin |