The Vanyar, the Noldor, and those of the Teleri who reached Valinor are called the Calaquendi (Elves of Light) because they saw the light of the Two Trees of Valinor. In Quenya, the language of the Noldor in Valinor, all other Elves were called the Moriquendi (Elves of Darkness) in recognition of the fact that they did not see (and did not desire) the Light of Valinor, but later the Sindar were counted among neither of these groups. Instead, Moriquendi was used for all other Elves except Noldor, Vanyar, Falmari, and Sindar. The Tolkien scholar Tom Shippey notes that the Sundering allowed Tolkien to explain the existence of Norse mythology's Dökkálfar and Ljósálfar, Light and Dark Elves. The Light Elves lived in Alfheim ("Elfhome") and correspond to his Calaquendi. The Dark Elves, who lived underground in Svartalfheim ("Black Elfhome"), Tolkien "rehabilitates" as his Moriquendi.
