Nornhabar 'Dwarrowdelf' is the Elvish name of Gabilgathol (later known as Moria) in The Later Quenta Silmarillion manuscripts in the 1950's (cf. The History of Middle-earth XI, p. 206, 209).
Later on, in the essay Quendi and Eldar Nornhabar was replaced by Hadhodrûd which was quite immediately changed to Hadhodrond - a form that entered into the printed Silmarillion.
The elements of the Sindarin name are Norno 'Dwarf' (< norna a. 'stiff, tough') and sabar 'mine'.