| Mendoza | Unisex | Spanish Names |
| Mer | Unisex | Spanish Names |
| Mercado | Unisex | Spanish Names |
| Merced | Woman | Spanish Names |
| Mercedes | Woman | Spanish Names |
| Merche | Woman | Spanish Names |
| Merida | Woman | Spanish Names |
| Merinda | Woman | Spanish Names |
| Meza | Unisex | Spanish Names |
| Micol | Man | Spanish Names |
| Miguel | Man | Spanish Names |
| Milagra | Woman | Spanish Names |
| Milagro | Man | Spanish Names |
| Milagros | Woman | Spanish Names |
| Milba | Woman | Spanish Names |
| Milburga | Woman | Spanish Names |
| Millán | Man | Spanish Names |
| Mincho | Man | Spanish Names |
| Mio | Woman | Spanish Names |
| Molina | Unisex | Spanish Names |