“On one point, however, the Dwarves were always “rigidly secretive… For reasons which neither Elves nor Men ever fully understood they would not reveal any personal names to people of other kin, nor later when they had acquired the arts of writing would allow them ever to be carved or written. They therefore took names by which they could be known to their allies in Mannish forms.” (PM:304) Appendix F in LotR confirms this: “Their own secret and ‘inner’ names, their true names, the Dwarves have never revealed to any one of alien race. Not even on their tombs do they inscribe them.” Hence the names Balin and Fundin, that occur in a Khuzdul context on the slab over Balin’s tomb, are not themselves Khuzdul. They are Mannish names, merely the substitute names Balin and his father Fundin used when non-dwarves were present.”
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