Here are some good boy names starting with the letter “P” (many are common among Jains and have good meanings):

1. Parth – King, Arjun’s name
2. Pranav – Sacred sound “Om”
3. Pratik – Symbol, sign
4. Piyush – Nectar, amrit
5. Pradeep – Light, lamp
6. Prashant – Peaceful, calm
7. Pravin / Praveen – Skilled, expert
8. Pranay – Love, affection
9. Pratham – First, foremost
10. Parmesh – God, supreme lord
11. Punit / Puneet – Pure, holy
12. Pankaj – Lotus
13. Prakash – Light
14. Paresh – Supreme soul, lord
15. Pratyush – Early morning sun
16. Pushkar – Lotus, holy lake
17. Pavitra – Pure
18. Prabhas – Lustrous, shining
19. Pranesh – Lord of life
20. Prerit – Inspired, motivated

If you tell me:

• Your community/tradition (e.g. Digambar / Shwetambar / Gujarati / Marwadi), and
• Whether you prefer very traditional Jain-style names (like based on Gunas, virtues, deities, Tirthankars etc.),

I can suggest a more focused list especially suitable for a Jain boy.