Here are some girl names starting with M whose total comes to numerology 6 (using the common Chaldean system, where we add numbers and reduce to a single digit):

1. Maisha
2. Malini
3. Meha
4. Mia
5. Mauli
6. Manali
7. Mayuri

All of these reduce to 6 (like 15 → 1+5 = 6). You can choose any based on meaning, sound, or cultural preference.