| Macario |
Magdalena / Magda / Malena |
| Madeleine / Maddalena |
Magno / Magnus |
| Maica / Maika / Mamen |
Maite / Mite |
| Malaquías |
Manolo / Manolete / Manoel |
| Manuel / Manuele |
Manuela / Manola |
| Mar |
Marcelino / Marcelina |
| Marcelo / Marcelio / Marcela |
Marcial |
| Marciana / Marciano |
Marcos / Marc / Mark / Marco |
| Marcus / Markus / Marko |
Margarita / Margarida / Margot |
| Margaritte / Margarie / Margaret |
Margery / Marjorie / Maggie / Meg |
| Maisie / Meg / Marga / Mamie |
Maria / Maruja / Manon / Mimi / Mia |
| Mariella / Mariola / Mariu / Meris |
Maribel / Marisa / Marina / Mario |
| Mariana / Marián |
Marino / Marin |
| Marta / Martha |
Martín / Martina |
| Maso |
Mateo |
| Matías / Marcián / Macías |
Matilde / Matilda / Metilde |
| Mafalda / Maud / Matty |
Mauricio / Maurizio / Morris |
| Mauro / Maurice / Maura |
Máxima / Maximiliana |
