| 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 | |
| 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 | |
| Leonidas | | - | Greek, Ancient Greek | |
| Leontios | | - | Ancient Greek | |
| Leontius | | - | Ancient Greek (Latinized) | |
| Leudagar | | - | Ancient Germanic | |
| Leudbald | | - | Ancient Germanic | |
| Leudoberct | | - | Ancient Germanic | |
| Leutgard | | - | Ancient Germanic | |
| Leuthar | | - | Ancient Germanic | |