| Luanne | | loo-AN | English | |
| Luba | | - | Russian, Ukrainian | |
| Lubbert | | - | Frisian | |
| Lubomierz | | luw-BAWM-yesh | Polish (Rare) | |
| LucÍA | | loo-THEE-ah (Spanish), loo-SEE-ah (Latin American Spanish) | Spanish | |
| LucÍLia | | - | Portuguese | |
| Lucan | | - | History | |
| Lucas | | LOO-kəs (English), LUY-kahs (Dutch), luy-KAH (French), LOO-kəsh (Portuguese), LOO-kahs (Spanish) | English, Dutch, French, Portuguese, Spanish, Biblical Latin | |
| Lucetta | | - | English | |
| Lucho | | - | Spanish | |
| Lucia | | loo-CHEE-ah (Italian), LOO-tsee-ah (German), LOO-shə (English), loo-SEE-ə (English) | Italian, German, English, Swedish, Norwegian, Danish, Romanian, Slovak, Ancient Roman | |
| Lucian | | LOO-shən (English) | Romanian, English | |
| Luciana | | loo-CHAH-nah (Italian), loo-THYAH-nah (Spanish), loo-SYAH-nah (Latin American Spanish) | Italian, Spanish, Portuguese, Ancient Roman | |
| Luciano | | loo-CHAH-no (Italian), loo-THYAH-no (Spanish), loo-SYAH-no (Latin American Spanish) | Italian, Spanish, Portuguese | |
| Lucifer | | LOO-si-fər (English) | Judeo-Christian Legend | |