Here are some Jain-friendly boy names starting with the letter A, with simple meanings:

1. Adinath – First Tirthankar (Rishabhdev); “primordial lord.”
2. Ajitnath – Tirthankar; “unconquered, undefeated.”
3. Arhan / Arhat – Worthy one; spiritually perfected soul.
4. Aagam / Agam – Jain scriptures; coming of divine knowledge. ( jainknowledge.com)
5. Anant – Infinite, endless (often used in Jain texts for infinite qualities of soul). ( jainknowledge.com)
6. Abhay – Fearless; free from fear (abhaya).
7. Amar – Immortal; pointing to the soul’s eternal nature.
8. Anish – Supreme, without master; often used in a spiritual sense.
9. Arvind / Aravind – Lotus; symbol of purity rising above the world.
10. Arpit – Offered, dedicated (to dharma or spiritual path).

If you want only names directly of Jain Tirthankars starting with A, the main ones are:

• Adinath (Rishabhdev)
• Ajitnath ( jainknowledge.com)

You can read more Jain baby-name related discussions here: