| Mo | | MO | English | |
| Modesty | | MAHD-əs-tee | English (Rare) | |
| Moe (1) | | MO | English | |
| Mohammad | | - | Persian, Arabic, Urdu, Punjabi, Pashto, Bengali | |
| Mohammed | | - | Arabic, Bengali | |
| Moira | | MOI-ra | Irish, Scottish, English | |
| Molle | | - | Medieval English | |
| Mollie | | MAHL-ee | English | |
| Molly | | MAHL-ee | English | |
| Mona (1) | | MO-nə (English) | Irish, English | |
| Monday | | MUN-day | English (Rare) | |
| Monica | | MAHN-i-kə (English) | English, Italian, Portuguese, Romanian, Late Roman | |
| Monique | | mo-NEEK (French), mə-NEEK (English) | French, English, Dutch | |
| Monna | | MO-nə | English | |
| Monroe | | mən-RO (English) | Scottish, English | |