| Lou | | LOO (English) | English, French | |
| Louane | | - | French | |
| Louis | | loo-EE (French), LOO-is (English) | French, English, Dutch | |
| Louise | | loo-EEZ (French, English), loo-EE-se (Danish) | French, English, Danish, Swedish, Dutch | |
| Louisette | | - | French | |
| Louna | | - | French (Modern) | |
| Loup | | - | French | |
| Luc | | LOOK | French | |
| Lucas | | LOO-kəs (English), LUY-kahs (Dutch), luy-KAH (French), LOO-kəsh (Portuguese), LOO-kahs (Spanish) | English, Dutch, French, Portuguese, Spanish, Biblical Latin | |
| Luce | | LOO-che (Italian), LOOS (French) | Italian, French | |
| Lucette | | - | French | |
| Lucie | | luy-SEE (French), luw-TSI-e (Czech) | French, Czech | |
| Lucien | | - | French | |
| Lucienne | | luy-SYEN | French | |
| Lucile | | loo-SEEL | French, English | |