| Name | Meaning | Gender | Origin |
|---|
| Lassie | Young girl | Female | English |
| Lenny | Brave lion | Unisex | German |
| Leo | Lion | Male | Latin |
| London | From London | Male | English |
| Lorelei | Murmuring rock | Female | German |
| Lucky | Fortunate | Unisex | English |
| Magenta | A vivid purplish red colour | Unisex | English |
| Marley | Pleasant wood | Female | English |
| Marmaduke | Devotee of Maedoc | Male | Gaelic |
| Marshall | Horse servant | Male | Germanic |
| Maximillian | Little Maximus | Male | Latin |
| Mignon | Cute | Female | French |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Missy | Bee | Female | Greek |
| Mo | Moor | Unisex | Latin |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Moses | Drawn out of the water | Male | Hebrew |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | English |
| Murray | Man of the sea | Male | Gaelic |
| Nana | Grace | Unisex | Hebrew |
| Nanook | Polar bear | Unisex | Native American |
| Napoleon | Sons of the mist, a race of dwarves | Male | Germanic |
| Neil | Champion | Male | Gaelic |
| Neo | New | Male | English |
| Nero | Stern | Male | Latin |
| Nikki | Victory of the people | Female | Greek |
| Nipper | A small boy | Unisex | English |
| Odie | Woad hill | Unisex | English |
| Olive | Olive | Female | English |