Here are some Jain boy names starting with “M”:

• Mahavir — great hero; also the name of Bhagwan Mahavir
• Moksh — liberation
• Mokshit — one who is oriented toward liberation
• Munisuvrat — name of the 20th Tirthankar
• Mudit — happy, joyful
• Manish — wise, intelligent
• Manoj — born of the mind
• Mihir — sun, radiant
• Mehul — rain, pleasant
• Mahan — great, noble
• Mahendra — great lord
• Mangal — auspicious
• Milan — union, togetherness
• Manav — human, noble being
• Manan — reflection, contemplation

If you want, I can also give:

• modern Jain boy names with meaning
• unique Jain baby boy names starting with M
• names inspired by Tirthankars and virtues