Bereg, a grandson of Baran, was dissatisfied with Estolad, and so he in about FA 365 led a thousand men of the House of Bëor away southwards out of the Beleriand, disappearing from the histories. It is possible some of his descendants were the ancestors of the later Men of Eriador.
In the book Silmarillion, Galdweth (man) is told a story by Haldad about his childhood rival, Bereg of Bëor, after talking with him in a party arranged by Haleth of the House of Haleth, daughter of Haldad. In this conversation, Galdweth calls Bereg the name he used in his childhood, Hardur. Bereg replies by saying that he has finally reclaimed the name of Bereg of Bëor (also called Prince), grandson of Baran. Bereg reclaims then Haleth as his wife (Galdweth had a crush on Haleth).