§ Of the Coming of Men into the West The Silmarillion

Then by the advice of Felagund Bëor gathered all the wandering families and kindreds of his people, and they removed over Gelion, and took up their abode in the lands of Amrod and Amras, upon the east banks of the Celon south of Nan Elmoth, near to the borders of Doriath; and the name of that land thereafter was Estolad, the Encampment. But when after a year had passed Felagund wished to return to his own country, Bëor begged leave to come with him; and he remained in the service of the King of Nargothrond while his life lasted. In this way he got his name, Bëor, whereas his name before had been Balan; for Bëor signified 'Vassal' in the tongue of his people. The rule of his folk he committed to Baran his elder son; and he did not return again to Estolad.