| Lughaidh | | LOO-ee | Irish, Irish Mythology | |
| Luigsech | | - | Ancient Irish | |
| Luis | | LWEES | Spanish | |
| Luisa | | LWEE-sah (Spanish), LWEE-zah (Italian) | Spanish, Italian | |
| Luisina | | lwee-SEE-nah | Spanish | |
| Luisinho | | - | Portuguese | |
| Luisita | | lwee-SEE-tah | Spanish | |
| Luiz | | - | Portuguese (Brazilian) | |
| Luiza | | luw-EE-zah (Polish) | Polish, Portuguese, Romanian | |
| LukÁŠ | | - | Czech, Slovak | |
| Luka | | - | Russian, Serbian, Croatian, Slovene, Macedonian, Georgian, Old Church Slavic | |
| Lukas | | LOO-kahs (German) | German, Swedish, Norwegian, Danish, Lithuanian | |
| Luke | | LOOK (English) | English, Biblical | |
| Luken | | - | Basque | |
| Luksa | | LOOK-sah | Esperanto | |