The most common Quenya word for “sea”, derived from the root √GAYAR (or sometimes √AYAR), where the vowel combination was the result of the frequent Quenya sound change whereby aya > ëa.
Conceptual Development: As an element in the name ᴱQ. Earendel, this word first appeared as ᴱQ. ea or ᴱQ. earen “eagle” (QL/34). But by the 1940s Tolkien changed the form and meaning of this name to ᴹQ. Earendil “Friend of the Sea” (SD/237), and the word ᴹQ. ear “sea” appeared in The Etymologies of the 1930s as a derivative of ᴹ√AYAR (Ety/AY). In The Notion Club Papers of the 1940s it had the form eare and the gloss “open sea” (SD/241, 305). The first appearance of the “sea” meaning of this word seems to be in a word-list associated with the Ambarkanta “Shape of the World” from the early 1930s, where ear had the glosses “water, sea” (SM/241), though in later writings only “sea” remained.
ëar noun "sea" (AYAR/AIR [gives also dat. sg. ëaren],WJ:413; see Letters:386 for etymology). Not to be confused with the pl. form of the verb ëa "be, exist". Pl. ëari "seas" (FS, LR:47); Eär "the Great Sea" (cf. ëaron "ocean"), ablative Eärello "from the Great Sea", et Eärello "out of the Great Sea" (EO). Eärë noun "the open sea" (SD:305). Compound ëaruilë noun "seaweed" (UY). Found in proper names like Eärendil "Sea-friend", Eärendur masc. name, *"Sea-servant"; in effect a variant of Eärendil(Appendix A). Eärendur was also used ="(professional) mariner" (Letters:386).Fem. name Eärwen "Sea-maiden" (Silm); Eärrámë "Sea-wing", "Wings of the Sea", name of Tuor's ship (RAM, AYAR/AIR, SA)