A serious concern of JRR Tolkien.
That’s one of the reasons his books are so entertaining. I have (I think...) a couple of paperback books written about T’s work, the Lin Carter one being the better of the two. He discusses how the Elder Edda was the source of a number of T’s character names, including Gandalf, most of the Hobbit’s dwarves, as well as the three backstory dwarves mentioned in Balin’s diary (as it turns out, Carter didn’t notice those I guess).
I think I need something old/new to watch, from childhood: