| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 541 | Melosa | Spanish | Sweet. | F | |
| 542 | Melosia | Spanish | Sweet. | F | |
| 543 | Mendi | Spanish | Reference to the Virgin Mary. | F | |
| 544 | Mercedes | Spanish | Mercy. Derived from one of the Spanish titles for the Virgin Mary (Maria de las Mercedes). | F | |
| 545 | Mercy | Spanish | Diminutive of Mercedes: Mercy. Derived from one of the Spanish titles for the Virgin Mary (Maria de las Mercedes). | F | |
| 546 | Milagritos | Spanish | Miracle. | F | |
| 547 | Milagros | Spanish | Miracle. | F | |
| 548 | Milagrosa | Spanish | Miracle. | F | |
| 549 | Mimi | Spanish | Pet name for Mira; Maria and Noemi. | F | |
| 550 | Miranda | Spanish | Admirable. | F | |
| 551 | Mirari | Spanish | Miracle. | F | |
| 552 | Mireya | Spanish | Miracle. | F | |
| 553 | Modesta | Spanish | Modest. | F | |
| 554 | Modeste | Spanish | Modest. | F | |
| 555 | Molara | Spanish | Reference to the Virgin Mary. | F | |
| 556 | Monica | Spanish | Advisor. | F | |
| 557 | Mora | Spanish | Little blueberry. | F | |
| 558 | Morisa | Spanish | Feminine of Maurice: dark;dark-skinned. | F | |
| 559 | Morissa | Spanish | Feminine of Maurice: dark;dark-skinned. | F | |
| 560 | Naiara | Spanish | Reference to the Virgin Mary. | F | |