Interesting idea about the meaning of the word 'phul'. I think it is worth researching it a bit to see if there anywhere else is evidence that support the idea. 
 
Ariel is right, it will not be easy. 
However a way in which it can be done, is to find the names used in Rajasthan at a certain time, both the Persian names but also the local Hindu names. This way the area is geographically bound. 
Also one could start with a limited number of weapons. 
 
Jens
		 
		
		
		
		
		
		
		
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