Here are Jain-friendly boy names starting with K (with simple meanings):

• Kalyan — auspicious or blessed
• Kshama — forgiveness or forbearance
• Kirti — fame or reputation
• Kirtan — devotional hymn or praise
• Kundan — precious or jewel-like
• Kumud — moonlight or beauty
• Kamal — lotus
• Keshav — a name often used for the divine (commonly used across Indian traditions)

Note: In Jain tradition, Kalyan and Kshama are especially aligned with Jain virtues (auspiciousness and forgiveness). Some names like Keshav or Kumud are widely used in broader Indian culture as well; you can choose based on how closely you want the name to reflect Jain dharma.