Vala of visions and dreams, spouse of Estë, usually referred to by the name of his realm Lórien (S/28). His name is translated “(Master of) Desire” or “Desirer” (MR/150, WJ/403, PE21/85). It is probably a translation of his (unknown) Valarin name (WJ/403). It is most likely a compound of írë “desire” and the agental suffix -mo.
Conceptual Development: In Silmarillion revisions from the beginning of the 1950s, this name first appeared as Lís, later changed to Irmo (MR/150). In earlier Silmarillion drafts from the 1930s, ᴹQ. Lórien was his true name, and he was also known by the sobriquet ᴹQ. Olofantur.
Irmo masc. name "Desirer", name of a Vala; normally called Lórien, properly the place where he dwells (WJ:402)