| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Leolin | - | Welsh | ||
| Lewella | - | Welsh | ||
| Lleu | LAY | Welsh Mythology | ||
| Lleucu | - | Welsh | ||
| Llew | - | Welsh, Welsh Mythology | ||
| Llewella | - | Welsh | ||
| Llewellyn | le-WEL-in | Welsh | ||
| Llewelyn | - | Welsh | ||
| Llinos | LEEN-aws, LIN-aws | Welsh | ||
| Llyr | - | Welsh Mythology | ||
| Llywellyn | li-WEL-in | Welsh | ||
| Llywelyn | li-WEL-in | Welsh | ||
| Lowri | - | Welsh | ||
| Luned | LIN-ed (Welsh) | Welsh, Welsh Mythology, Arthurian Romance | ||
| Lunete | - | Welsh Mythology, Arthurian Romance |