| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1641 | Lizann | Greek | Liberator. Feminine of Lysander. | F | |
| 1642 | Lizbeth | Greek | Diminutive of Elizabeth: From the Hebrew Elisheba, meaning either oath of God, or God is satisfaction. Also, the lilly flower. | F | |
| 1643 | Lizzie | Greek | Diminutive of Elizabeth: From the Hebrew Elisheba, meaning either oath of God, or God is satisfaction. Also, the lilly flower. | F | |
| 1644 | Lizzy | Greek | Diminutive of Elizabeth: From the Hebrew Elisheba, meaning either oath of God, or God is satisfaction. Also, the lilly flower. | F | |
| 1645 | Loni | Greek | Short form of Apollonia. | F | |
| 1646 | Lotus | Greek | Flower. | F | |
| 1647 | Loxias | Greek | Crooked. | M | |
| 1648 | Lucas | Greek | Variant of Luke: Light giving. From Lucania (Lucania was a district of ancient Italy). | M | |
| 1649 | Luigina | Greek | Well born. | F | |
| 1650 | Luke | Greek | Light giving. From Lucania (Lucania was a district of ancient Italy). Luke was the author of the Acts of the Apostles and of the third Gospel in the New Testament, the patron saint of doctors and artists, and was known as 'the beloved physician'. | M | |
| 1651 | Lycaon | Greek | A king of Arcadia. | M | |
| 1652 | Lycomedes | Greek | A king of Scyros. | M | |
| 1653 | Lycoris | Greek | Twilight. | F | |
| 1654 | Lycurgus | Greek | A king of the Edones. | M | |
| 1655 | Lyda | Greek | Variant of Leda who was the Mythological queen of Sparta and mother of Helen of Troy. | F | |
| 1656 | Lydea | Greek | From Lydia. | F | |
| 1657 | Lydia | Greek | Woman from Lydia (in Asia Minor). | F | |
| 1658 | Lynceus | Greek | An Argonaut. | M | |
| 1659 | Lyra | Greek | Lyre (medeival instrument). Lyrical. | F | |
| 1660 | Lyris | Greek | Iyrical. | F | |