| Llassar | Legendary son of Llassar Llaes. |
| Llawr | Legendary son of Erw. |
| Llevelys | Legendary son of Beli. |
| LlewelIyn | Derived from lion leader. |
| Llewellyn | Meaning like a young lion. |
| Llinos | A Welsh name meaning goldfinch. |
| Llundein | The Welsh name for London city. |
| Llwybyr | Legendary son of Caw. |
| Llwyd | Legendary son of Kil Coed 'one with gray hair'. |
| Llwydeu | Legendary son of Nwython. |
| Llwyr | Legendary son of LIwyryon. |
| Llyn | A Welsh word meaning a lake. |
| Llyweilun | A variant of the name Llewelyn. |
| Lola | Form of CARLOTA; Form of Dolores, meaning woman of sorrow; Feminine form of Carlos manly: Abbreviation of Dolores full of sorrows.; Goddess Lakshmi; Form Of Louise |
| Lorena | Crowned With Laurel; Crowned with laurels; Laurel. The laurel tree or sweet bay tree symbolic of honor and victory. Old name with many variants.; Variant of Laura or Lora referring to the laurel tree or sweet bay tree symbolic of honor and victory. |
| Lowri | Crowned with laurels |
| Lubaba | Variant of Lubabah: The innermost essence. |
| Lucia | Feminine form of Lucius: Light.; Graceful Light. Italian variant of Lucy. Famous bearer: St Lucia was a virgin martyr who died in the 4th century. Her name is invoked against eye disease.; Light; The light of india; Form Of Lucy Which Means Light |
| Lug | Welsh form of Luke 'light'. |
| Lulu | Diminutive of Louisa: Latin feminine form of Louis: Famous warrior. Famous Bearer: Louisa M. Alcott, who wrote Little Women(1868).; Famous in war.; From the name LOUISA; Pet form of the names Louise or Louella.; Pearl; Pearl (Tanzanian).; Rabbit |
| Lydia | Beauty; A beautiful woman from Lydia; Happiness; From Lydia.; A Maiden from Lydia, Greece; A standing pool |
| Lyneth | A graceful and beautiful songbird. |
| Mabli | A Welsh name meaning lovable or dear. |
| Mabsant | Legendary son of Caw. |
| Mabyn | A name meaning child of joy. |
| Macsen | Variant of Maximus. Meaning |
| Madawc | A name meaning the benevolent |
| Madawg | Legendary son of Teithyon. |
| Maddisynne | Alternate Spelling: Madison. Son of Matthew. |
| Maddoc | A fortunate or lucky person |
| Maddockson | Son of Maddock. |
| Maddocson | Son of Maddock. |
| Maddog | A fierce or aggressive fighter |
| Madeeha | One who is worthy of praise |
| Madihah | A woman deserving of praise. |
| Madina | Land of beauty; Woman from Magdala. Variant of Madeleine. |
| Madoc | Derived from Welsh for fortunate. |
| Madog | A Welsh name meaning fortunate. |
| Mael | Legendary son of Roycol. |
| Maelgwyn | Prince of the hounds. |