| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 401 | Marcio | Italian | Of Mars. The Roman fertility god Mars for whom March was named. | M | |
| 402 | Marco | Italian | Italian form of Marcus: Mars (Roman god of war). Famous Bearer: Marco Polo (1254-1324), explorer from Venice. Warring. | M | |
| 403 | Marea | Italian | Bitter. | F | |
| 404 | Margherita | Italian | Bitter. | F | |
| 405 | Maria | Italian | Bitter. | F | |
| 406 | Mariella | Italian | Diminutive of Maria. | F | |
| 407 | Marietta | Italian | Variant of Mary: bitter. | F | |
| 408 | Mario | Italian | Bitter. | M | |
| 409 | Marquesa | Italian | Royalty. Italian royalty title. | F | |
| 410 | Marquise | Italian | A title name ranking below duke and above earl. | M | |
| 411 | Martino | Italian | Warrior of Mars. | M | |
| 412 | Martinus | Italian | Warrior of Mars. | M | |
| 413 | Massima | Italian | Great. | F | |
| 414 | Matteo | Italian | Gift of God. | M | |
| 415 | Maura | Italian | Dark skin. | F | |
| 416 | Maurio | Italian | Dark-skinned; A Moor. | M | |
| 417 | Maurizia | Italian | Bitter. | F | |
| 418 | Maurizio | Italian | Italian form of Maurice 'dark skinned'. | M | |
| 419 | Mauro | Italian | Dark-skinned; A Moor. | M | |
| 420 | Maximiliano | Italian | The greatest. | M | |