Board Thread:General Mod Discussion/@comment-30303386-20171104212518/@comment-28813058-20171106215054

Dragonovith wrote: "The language of Dale and the Long Lake would, if it appeared, be represented as more or less Scandinavian in character; but it is only represented by a few names, especially those of the Dwarves that came from that region. These are all Old Norse Dwarf-names."

It's from a letter Tolkien wrote to Naomi Mitchison. Almost every dwarf name, plus Gandalf’s name, are directly Norse.