A title for Aulë appearing in a very late note (LT1A/Talka Marda). The second element is clearly tamo “smith”, and the first element “World” may be either mar(da) or már. I consider the first of these to be more likely: see the entry for mar(da) for discussion.
Conceptual Development: An early form of this name appeared in the Lost Tales: ᴱQ. Talka Marda “Smith of the World” (LT1/180, LT1A/Talka Marda). The name appeared in The Etymologies from the 1930s as ᴹQ. Martan(o) “Earth-smith”, a compound of mar “Earth” and tano “smith” (Ety/MBAR, TAN). In notes from the 1950s, Tolkien revised tano >> tamo (PE17/107), which is probably the origin of the later form of this name.