Here are names starting with D that carry a similar strong, positive vibe (and can fit Jain naming sensibilities). I’ve included brief meanings in a Jain-friendly sense:

• Dharam (dharma) – righteousness, duty; aligns with Jain ideals of right conduct.
• Dheer (dhīra) – brave, steadfast; inner courage in following right path.
• Dhiraj (dhira-ja) – patience, steadiness; calm perseverance.
• Divya – divine, brilliant; radiance of spiritual clarity.
• Dipak (deepak) – lamp, illumination; guidance on the path of right conduct.
• Digambar – sky-clad; a direct reference to the Jain monastic tradition (if you want a sect-specific name).
• Dharmaendra / Dharmanand – lord of righteousness; exalted commitment to ethical living.
• Dinesh – moon of the day; often used for someone who brings calm or illumination.

If you’d like, tell me the exact vibe you want (more bold, more serene, etc.) and I can tailor a tighter list.