Can having a renal stone be a reason behind hair loss?

No, there shouldn't be any connection between your renal stone and your hair loss. Perhaps the stress the stones are causing you may be accelerating your loss, but it's incredibly unlikely it's the primary cause. I suggest you see a dermatologist/hair specialist to go over the status of your hair.

there is no relation between renal stone formation in kidney and chronic hair loss. The drugs that you use may cause hair loss. Please ask that point to your nephrologist .

No, having a renal stone is not associated with hair loss. The only exception would be if the stone was massive and caused renal failure.