| Lucius | | LOO:-ki-uws (Ancient Roman), LOO-shəs (English), LOO-see-əs (English) | Ancient Roman, Biblical, English | |
| Lucretia | | - | Ancient Roman, Roman Mythology | |
| Lucretius | | - | Ancient Roman | |
| Ludolf | | LOO-dawlf (German) | German, Dutch, Ancient Germanic | |
| Ludovicus | | - | Ancient Germanic (Latinized) | |
| Lugubelenus | | - | Ancient Celtic | |
| Luigsech | | - | Ancient Irish | |
| Luitgard | | - | German, Ancient Germanic | |
| Lutgardis | | - | Ancient Germanic (Latinized) | |
| Lycurgus | | - | Greek Mythology (Latinized), Ancient Greek (Latinized) | |
| Lycus | | - | Greek Mythology (Latinized), Ancient Greek (Latinized) | |
| Lykos | | - | Greek Mythology, Ancient Greek | |
| Lykourgos | | - | Greek Mythology, Ancient Greek | |
| Lysander | | - | Ancient Greek (Latinized) | |
| Lysandra | | - | Ancient Greek | |