§ Of the Coming of Men into the West The Silmarillion

Felagund himself often returned to visit Men; and many other Elves out of the west-lands, both Noldor and Sindar, Journeyed to Estolad, being eager to see the Edain, whose coming had long been foretold. Now Atani, the Second People, was the name given to Men in Valinor in the lore that told of their coming; but in the speech of Beleriand that name became Edain, and it was there used only of the three kindreds of the Elf-friends.