| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 381 | Irwyn | Anglo-Saxon | Sea lover. | M | |
| 382 | Isen | Anglo-Saxon | Iron. | M | |
| 383 | Iuwine | Anglo-Saxon | Friend. | M | |
| 384 | Jeffrey | Anglo-Saxon | Peaceful gift. | M | |
| 385 | Juliana | Anglo-Saxon | Name of a poem. | F | |
| 386 | Kendra | Anglo-Saxon | Prophetess. | F | |
| 387 | Kendrick | Anglo-Saxon | Fearless leader. | M | |
| 388 | Kendryek | Anglo-Saxon | Fearless leader. | M | |
| 389 | Kenric | Anglo-Saxon | Fearless leader. | M | |
| 390 | Kent | Anglo-Saxon | White. | M | |
| 391 | Kenway | Anglo-Saxon | Brave in war. | M | |
| 392 | Kim | Anglo-Saxon | Noble or brave. | M | |
| 393 | Kimball | Anglo-Saxon | Noble or brave. | M | |
| 394 | Landry | Anglo-Saxon | Ruler. | M | |
| 395 | Lang | Anglo-Saxon | Long. | M | |
| 396 | Lange | Anglo-Saxon | Long. | M | |
| 397 | Lar | Anglo-Saxon | Teaches. | M | |
| 398 | Larcwide | Anglo-Saxon | Counsel. | M | |
| 399 | Leanian | Anglo-Saxon | Reward. | M | |
| 400 | Leax | Anglo-Saxon | Salmon. | M | |