| LÓEgaire | | - | Irish Mythology, Ancient Irish | |
| Laelia | | - | Ancient Roman | |
| Laelius | | - | Ancient Roman | |
| Lambert | | LAHM-bert (German), LAHM-bərt (Dutch), lam-BER (French), LAM-bərt (English) | German, Dutch, French, English, Ancient Germanic | |
| Lamprecht | | LAHMP-rekht (German) | German (Archaic), Ancient Germanic | |
| Landebert | | - | Ancient Germanic | |
| Lanzo | | LAHN-tso (German) | German, Ancient Germanic | |
| Laurentia | | - | Ancient Roman | |
| Laurentina | | - | Ancient Roman | |
| Laurentinus | | - | Ancient Roman | |
| Laurentius | | - | Ancient Roman | |
| Leifr | | - | Ancient Scandinavian | |
| Leobwin | | - | Ancient Germanic | |
| Leon | | LEE-awn (English), LE-awn (German, Polish) | English, German, Polish, Slovene, Croatian, Dutch, Ancient Greek | |
| Leonard | | LEN-ərd (English), LAY-o-nahrt (Dutch) | English, Dutch, German, Ancient Germanic | |