| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 541 | Leonore | French | Shining light. Variant of Eleanor. | M | |
| 542 | Leroi | French | The king. | M | |
| 543 | Leron | French | The circle. | M | |
| 544 | Leroux | French | The red-haired one. | M | |
| 545 | Leroy | French | The King (from 'le roi'). Originally a surname, it is now more common as a first name. | M | |
| 546 | Leveret | French | Young rabbit. | M | |
| 547 | Leverett | French | Young rabbit. | M | |
| 548 | Lewis | French | Variant of Louis: Famous warrior, from the Old German 'Chlodovech'. Aloysius is the name of the Italian Saint Aloysius of Gonzaga, and common among British Roman Catholics. | M | |
| 549 | Lionel | French | Young lion. | M | |
| 550 | Lionell | French | Young lion. | M | |
| 551 | Lisle | French | From the island. | M | |
| 552 | Lonell | French | Young lion. | M | |
| 553 | Lonnell | French | Young lion. | M | |
| 554 | Loring | French | From Lorraine. | M | |
| 555 | Lothair | French | Fighter. | M | |
| 556 | Lou | French | Diminutive of Louis: Famous warrior, from the Old German 'Chlodovech'. Eighteen kings of France have borne this name, and Louis was used by the French royal family for hundreds of years. Famous Bearer: Jazz musician Louis Armstrong (l900-1971). | M | |
| 557 | Louie | French | Variant of Louis: Famous warrior, from the Old German 'Chlodovech'. | M | |
| 558 | Louis | French | Famous warrior, from the Old German 'Chlodovech'. Eighteen kings of France have borne this name, and Louis was used by the French royal family for hundreds of years. Famous Bearer: Jazz musician Louis Armstrong (l900-1971). | M | |
| 559 | Louvel | French | Little wolf. | M | |
| 560 | Lovell | French | Wolf cub. Encountered more often as a surname rather than as a first name. | M | |