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| Maarten | Variant of Martin |
| Mackenzie | Mackenzie |
| Madison | Madison |
| Maicon | Variant of Michael |
| Malachi | Malachi |
| Malcolm | Malcolm |
| Malik | Malik |
| Manoel | Variant of Manuel |
| Manolo | Variant of Manuel |
| Manuel | Manuel |
| Manuele | Variant of Manuel |
| Marc | Variant of Mark |
| Marcel | Marcel |
| Marcello | Variant of Marcel |
| Marcellus | Variant of Marcel |
| Marcelo | Variant of Marcel |
| Marco | Variant of Mark |
| Marcos | Variant of Mark |
| Marcus | Variant of Mark |
| Mario | Variant of Marius |
| Marius | Marius |
| Mark | Mark |
| Marko | Variant of Mark |
| Markus | Variant of Mark |
| Marlon | Variant of Mark |
| Marques | Variant of Marquis |
| Marquez | Variant of Marquis |
| Marquis | Marquis |
| Marquise | Variant of Marquis |
| Marshall | Marshall |
| Marten | Variant of Martin |
| Martin | Martin |
| Martino | Variant of Martin |
| Marvin | Marvin |
| Marzell | Variant of Marcel |
| Marzellus | Variant of Marcel |
| Mason | Mason |
| Massimiliano | Variant of Maximilian |
| Mateo | Variant of Matthias |
| Mathew | Variant of Matthias |
| Mathias | Variant of Matthias |
| Mathieu | Variant of Matthias |
| Mathis | Variant of Matthias |
| Matias | Variant of Matthias |
| Matt | Variant of Matthias |
| Mattäus | Variant of Matthias |
| Matteo | Variant of Matthias |
| Matthäus | Variant of Matthias |
| Matthew | Variant of Matthias |
| Matthias | Matthias |
| Mattia | Variant of Matthias |
| Mattias | Variant of Matthias |
| Maurice | Maurice |
| Mauricio | Variant of Maurice |
| Mauritius | Variant of Maurice |
| Mauritz | Variant of Maurice |
| Maurizio | Variant of Maurice |
| Mauro | Variant of Maurice |
| Maurus | Variant of Maurice |
| Max | Variant of Maximilian |
| Maxim | Maxim |
| Maxime | Variant of Maxim |
| Maximilian | Maximilian |
| Maximilien | Variant of Maximilian |
| Maximillia | Variant of Maximilian |
| Maximus | Variant of Maxim |
| Maxwell | Maxwell |
| Meik | Variant of Michael |
| Melville | Melville |
| Melvin | Variant of Melville |
| Micah | Micah |
| Michael | Michael |
| Michail | Variant of Michael |
| Micheal | Variant of Michael |
| Michel | Variant of Michael |
| Michele | Variant of Michael |
| Mick | Variant of Michael |
| Mickey | Variant of Michael |
| Miguel | Variant of Michael |
| Mikael | Variant of Michael |
| Mike | Variant of Michael |
| Mikel | Variant of Michael |
| Miles | Miles |
| Milton | Milton |
| Misael | Misael |
| Mischa | Variant of Michael |
| Mitar | Variant of Dimitri |
| Mitchel | Variant of Mitchell |
| Mitchell | Mitchell |
| Mohamed | Variant of Muhammad |
| Mohammad | Variant of Muhammad |
| Mohammed | Variant of Muhammad |
| Moises | Variant of Moses |
| Montana | Montana |
| Morgan | Morgan |
| Moritz | Variant of Maurice |
| Moriz | Variant of Maurice |
| Morris | Variant of Maurice |
| Morten | Variant of Martin |
| Moses | Moses |
| Moshe | Variant of Moses |
| Moufid | Variant of Mufid |
| Mufid | Mufid |
| Muhammad | Muhammad |
| Myles | Variant of Miles |
| Myron | Myron |