Here are some simple, auspicious name ideas for a grain merchant business:

1. Shree Grain Traders
2. Annapurna Grains & Pulses
3. Shubhlabh Grain Market
4. Mahavir Grain Centre
5. Jai Jinendra Grain House
6. Shree Jain Grain Bhandar
7. Dhanyalakshmi Grain Depot
8. Shantinath Grains & Pulses
9. Sukhsagar Grain Traders
10. Satvik Grain Mart
11. Mangalam Grain Agency
12. Shree Krupa Grain Suppliers
13. Sukhmangal Grains
14. Dharmarth Grain Store
15. Bhagyalaxmi Grain Hub

If you tell me:

• City/area
• Whether you want it in English, Hindi, or mixed
• Traditional or modern style

I can suggest more focused names and even check which look good for a shop board.