| Lech | | LEKH (Polish) | Polish, Slavic Mythology | |
| LechosŁAw | | le-KHAW-swahf | Polish | |
| LechosŁAwa | | le-khaw-SWAH-vah | Polish (Rare) | |
| Lena | | LE-nah (German, Polish, Italian), LYE-nah (Russian), LEE-nə (English) | Swedish, Norwegian, Danish, German, Polish, Russian, English, Italian, Portuguese | |
| Leokadia | | le-aw-KAHD-yah | Polish | |
| Leon | | LEE-awn (English), LE-awn (German, Polish) | English, German, Polish, Slovene, Croatian, Dutch, Ancient Greek | |
| Leopold | | LE-o-pawlt (German), LAY-o-pawlt (Dutch), LEE-ə-pold (English), le-AW-pawlt (Polish) | German, Dutch, English, Slovene, Polish | |
| LesŁAw | | LES-wahf | Polish | |
| LesŁAwa | | le-SWAH-vah | Polish | |
| Leszek | | LE-shek | Polish | |
| Lew | | LEF | Polish | |
| Lidia | | LEED-yah (Polish), LEE-dyah (Italian), LEE-dhyah (Spanish) | Polish, Italian, Spanish, Romanian | |
| Lidka | | - | Polish | |
| Liliana | | lee-LYAH-nah (Italian, Polish), lil-ee-AN-ə (English) | Italian, Spanish, Portuguese, Romanian, Polish, English | |
| Liwia | | - | Polish | |