Here are some good Jain-friendly boy names starting with K, with simple meanings:

1. Kamal – lotus, purity
2. Kamalraj – king of lotus, very pure soul
3. Kamalnayan – one with lotus-like eyes (soft and kind)
4. Kalyan – welfare, auspiciousness
5. Kalyankumar – boy who brings welfare and goodness
6. Kanchan – gold, pure like gold
7. Kundan – refined gold, very pure
8. Kundankumar – boy as pure as refined gold
9. Kshitij – horizon, broad vision
10. Kirtan – devotional singing, remembrance of Bhagwan
11. Kirtikumar – boy of good fame and virtues
12. Kshama – forgiveness
13. Kshamankumar – boy full of forgiveness
14. Krupal – compassionate, kind
15. Krupesh – lord of compassion, very merciful
16. Kushal – expert, capable, auspicious
17. Ketan – flag, symbol, sign of goodness
18. Kavin – handsome, gentle and good-natured

If you share your surname and language preference (Hindi/Gujarati/English style), I can suggest a few that match nicely with your family name.