Here are some good Jain-friendly boy names starting with “K”:

1. Karmesh – one who understands/controls his karma
2. Kalyan – auspicious, welfare of all beings
3. Kushal – skilful, right‑doing, successful in good deeds
4. Krupal / Krupesh – merciful, full of compassion (krupā)
5. Kirtan – devotional praise of the Arihant and Siddha
6. Kirti / Keerti – fame earned through good conduct
7. Kshama / Kshamya / Kshamit – forgiving, one who forgives
8. Kshitij – horizon; symbolically, broad vision and outlook
9. Kundan / Kundal – pure like refined gold
10. Kumarpal – famous Jain-king’s name; protector, noble prince
11. Kshamansh – a part (aṃś) of forgiveness
12. Kanchan / Kanchit – pure, golden
13. Kalpit – one who is well‑disciplined and orderly
14. Kavit / Kavyaansh – poetic, thoughtful mind
15. Kirtikumar – boy with noble fame

All of these can be used by Jains; many reflect Jain values like kshamā (forgiveness), ahimsā, purity and good conduct.