| Jehiel | God Lives, Whom God preserves, Alive |
| Jehosaphat | God has judged, Whom God judges |
| Jehoshafat | God has judged, Whom God judges |
| Jenkin | God is gracious |
| Jep | A short form meaning God will add. |
| Jephtha | He Opens, Whom God sets free |
| Jeptha | He Opens, Whom God sets free |
| Jerahmiel | May God have pity, Whom God loves |
| Jere | Appointed by the lord |
| Jeremiel | May God have pity, Whom God loves |
| Jerrard | Spear Strong, Spear Brave |
| Jeshaiah | God is salvation |
| Johnie | God is gracious |
| Jona | A gift given by the heavens. |
| Jophiel | The beauty of the heavens. |
| Joshaphat | God has judged, Whom God judges |
| Joshawa | God is salvation |
| Josse | A name meaning a follower of the Lord. |
| Julyan | Descended from Jupiter (Jove), Youth |
| Kae | A name meaning a willow tree. |
| Kaolin | Little Slender One |
| Kenith | Born of fire, Comely, Finely made |
| Kennith | Born of fire, Comely, Finely made |
| Keshaun | God is gracious |
| Kiaran | Little black one |
| Killeen | A small church or cell |
| Kimbel | Royal Courage, Royal Brave |
| Kirsey | Variant of Kirk, derived from Old English 'circe' meaning lord or ruler, and 'sey' meaning island. |
| Kolman | A name meaning dark coal worker. |
| Kynaston | Settlement of Cynefrid |
| Lake | A large body of water on the land. |
| Lanford | Long river crossing, Long ford |
| Larkin | A descendant of the fierce one. |
| Larrie | Derived from the laurel tree. |
| Laz | A name meaning God is help. |
| Lem | Belonging to God |
| Leolin | Oath of Belenus |
| Lewin | Derived from the dear friend. |
| Leyton | From the meadow town by the lea. |
| Lindon | A name meaning linden hill. |