Tharkûn

The name given to Gandalf by the Dwarves. It is interpreted 'Staff-man', and thus it is close in meaning to the name 'Gandalf' itself (which means 'Elf of the Wand'). Though we know for sure that at least some Dwarves used this name, it doesn't appear to have been universal. During the Quest of Erebor, as a prominent example, the Dwarves of Thorin's Company referred to the Wizard simply as 'Gandalf' throughout the journey. Perhaps they simply wanted to avoid revealing his name in their own secret tongue, but alternatively this fact may hint that the name was used by other Dwarves outside Thorin's Longbeard clan.