Here are some Jain-inspired baby boy names starting with R:

• Rishabh — first Tirthankar, a very sacred Jain name
• Rajat
• Rajendra
• Rachit
• Ritvik
• Rishit
• Ravin
• Rajiv
• Runak
• Ranveer

If you want, I can also give:

• modern Jain boy names starting with R
• unique Jain names starting with R
• names with meanings