A suffix of which Tolkien said “the ending -mo often appeared in names or titles, sometimes with an agental significance” (WJ/400). It is based on the pronoun mo “(some)one”. This suffix is often specifically neuter, as in [ᴹQ.] nilmo “friend” vs. male and female [ᴹQ.] nildo and nilde (Ety/NIL).
Conceptual Development: The suffix ᴱQ. -mo appears all the way back in the Qenya Lexicon of the 1910s in words like ᴱQ. laulemo “inhabitant” and ᴱQ. qolimo “invalid” (QL/52, 78).
-mo ending frequent in names and titles, sometimes with an agental significance (WJ:400)