As the first found inscriptions that mention keris call it kres, it might be safe to assume that from the beginning the greneng was called a greneng. The Balinese alphabet does have a dha, by the way. 
 
When did the keris begin to have non-weapon function features? I would say from the beginning, as soo as the ganja was attached there you have a non weapon form to follow a symbolic function. 
 
Salam hangat, 
Bram
		 
		
		
		
		
		
		
		
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