| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 861 | Matias | Spanish | Gift of God. | M | |
| 862 | Matro | Spanish | God's gift. | M | |
| 863 | Maureo | Spanish | Dark-skinned; A Moor. | M | |
| 864 | Mauricio | Spanish | Moorish. | M | |
| 865 | Mauro | Spanish | Moorish. | M | |
| 866 | Maya | Spanish | Abbreviation of Amalia; variant of Maia. | F | |
| 867 | Melisandra | Spanish | Strength; determination. | F | |
| 868 | Melisenda | Spanish | Sweet. | F | |
| 869 | Melita | Spanish | Abbreviation of Carmelita. | F | |
| 870 | Melosa | Spanish | Sweet. | F | |
| 871 | Melosia | Spanish | Sweet. | F | |
| 872 | Mendi | Spanish | Reference to the Virgin Mary. | F | |
| 873 | Mercedes | Spanish | Mercy. Derived from one of the Spanish titles for the Virgin Mary (Maria de las Mercedes). | F | |
| 874 | Mercy | Spanish | Diminutive of Mercedes: Mercy. Derived from one of the Spanish titles for the Virgin Mary (Maria de las Mercedes). | F | |
| 875 | Miguel | Spanish | Spanish form of Michael 'God like'. | M | |
| 876 | Milagritos | Spanish | Miracle. | F | |
| 877 | Milagros | Spanish | Miracle. | F | |
| 878 | Milagrosa | Spanish | Miracle. | F | |
| 879 | Mimi | Spanish | Pet name for Mira; Maria and Noemi. | F | |
| 880 | Miranda | Spanish | Admirable. | F | |