I changed this page to "Bjørli" to reflect local spelling (which of course is immensely variable). There's no problem with changing it back, but the majority of residents (as far as I am aware) spell it with an "Ø", not an "O"  

 Welcome. Obviously you're familiar with the area, if not a native. Which makes sense, since most changes go in the opposite direction (i.e., Anglicize the word). Pleased to see you here on Wikipedia. 
 Propose to stick with the Norwegian naming convention (esp. since it corresponds to the Lesja municipality web site). But will revise the article to show the alternative spelling as well. 
 Are you still living in the Lesja area? If so, any chance you have photos or other local material? This is a thin group of articles for a magnificant area.  
 Tusen takk -