I am no expert of Sami knives but I have studied some of the Sami religions and cultures. 
The Sami people consists of several different sub-groups who have their own, quite different, languages. Their languages are closer related to Finnish than any of the Scandinavian languages. But still it is so different that the sub-groups cannot understand each other's languages, i.e. it is not dialects.  
So unless you know which sub-group the specific knife comes from you cannot decide what it is supposed to be called locally.  
I know less about North American Indian tribes but I suspect that it is the same situation there if you want to find out the original native name for one of their knives?  
 
Michael
		 
		
		
		
		
		
		
		
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