| Name | Meaning | Gender | Origin |
|---|
| Jagger | Pedlar | Male | English |
| Jake | Supplanted | Male | Hebrew |
| Jan | God is gracious | Male | Hebrew |
| Jason | Healer | Male | Greek |
| Jasper | Treasurer | Male | Persian |
| Jennis | Variation Of Jenny Which Is A Diminutive Of Jane And Jennifer. | Unisex | American English |
| Jess | Variant Of Jesse Jehovah Exists. | Unisex | Literary |
| Jilly | Down-bearded youth | Unisex | Latin |
| Jose | May God Give Increase. | Male | English |
| Jumper | | Unisex | Hebrew |
| Junior | Younger | Male | English |
| Kasey | From Cayce | Male | American English |
| Kasper | Treasurer | Unisex | Persian |
| Keane | Descendant of Cathán | Male | Gaelic |
| Keegan | Son of Aodhagáin | Male | Gaelic |
| Kent | Uncertain, perhaps coastal region | Male | English |
| Kewpie | | Unisex | Hebrew |
| Kiki | Pet form of names in K | Male | English |
| Kisses | One who likes to kiss | Unisex | English |
| Kit | Bearer of Christ | Unisex | Greek |
| Knox | Round-topped hill | Male | English |
| Ladd | Attendant | Male | English |
| Lady | Lady | Unisex | English |
| Lancelot | Knight Of Arthur And Lover Of Guinevere | Male | French |
| Lennon | Descendant of Leannán or Lonán | Male | Gaelic |
| Liam | Will, desire and helmet, protection | Male | Germanic |
| London | From London | Male | English |
| Lucky | Fortunate | Unisex | English |
| Lynne | A Cascade | Unisex | English |
| Maddock | Good | Male | Welsh |