- Maarjaara Cat (Sanscrit).
- Magellan Spanish explorer
- Maggie
- Magpie
- Majc
- Mandolin
- Mango
- Marmaduke A Great Dane in the comic strip of the same name.
- Maybe
- Mehitabel
- Meowser
- Meridian
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- Merlin A magician in the legends of Camelot and King Arthur.
- Milisande
- Mimic
- Mirabelle
- Mirable
- Mirage
- Mollie
- Molly
- Montgomery
- Moriarty Villian in the Shelock Holmes books by Sir Arthur Conan Doyle.
- Mulligan
- Myrddin A Celtic poet from the 500's, possibly the origin of the story of Merlin.
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