Here are Jain-friendly baby girl names starting with M (with simple meanings). These are commonly used in Jain families and/or connected to Jain history, devis, or virtues:

From Jain Itihas / revered women

• Malli / Malliṇa / Mallika – connected to Bhagwan Mallinath (19th Tirthankar; in Śvetāmbara tradition, considered female)
• Marudevī – mother of Ādinath Bhagwan
• Mrugāvatī / Mrigāvatī – known for purity and devotion in Jain stories
• Mahāprabhā / Mahaprabhāvatī – great radiance, spiritual shine

Virtue- and quality-based (good Jain bhāvarth)

• Maitrī – friendliness, loving-kindness to all jivas
• Madhurā / Madhuri – sweetness (in speech and behaviour)
• Mahikā / Mahitā – great, honoured
• Mahima – greatness (of qualities, not ego)
• Mānasi / Manasā – of the mind; good thoughts
• Manvi / Mānavī – humane, compassionate
• Mṛdulā / Mridu – soft‑natured, gentle
• Mālinī – garlanded, adorned with virtues
• Mahāśrī / Mahashri – great auspiciousness
• Mānasi Kṣamā (double name) – mind full of forgiveness

Simple modern-style names okay for Jain families

• Mahi – earth, world (can remember all jivas in the world)
• Myra / Mira – affectionate, admirable
• Manya – respectable, worthy of honour
• Misha – smiling, sweet-natured
• Megha / Meghnā – cloud; giver of coolness, comfort
• Miraali / Minali – gentle, like a bird / fish; soft nature

All these are acceptable in Jain tradition as long as the intention (bhāva) is good and you avoid names clearly rooted in other-devatā worship.

If you want, you can also explore a broader Jain baby girl names list here