A name for Aulë as father of the dwarves (PM/391). The second element is clearly atar “father”, but the meaning of the initial element is more difficult to determine. It might be a prefixal form Nau- of nauco “Dwarf”, or it could the word náva “hollow” associated with Dwarves via the name Návarot.
Quenya
Návatar
father
návatar
masculine name. *Dwarf-father
Návatar noun a title of Aulë referring to his position as the immediate author of the Dwarvish race, apparently including atar "father", but the first element cannot be related to any known term for "Dwarf" (PM:391 cf. 381)