In the fiction of J. R. R. Tolkien, the House of Bëor was the oldest of the Three Houses of Men that had allied with the Elves in the First Age.
Warning: Wikipedia contains spoilers
Bëor the Old, originally named Balan, the founder of the House, was the first to lead Men across the Ered Luin (Blue Mountains) into Beleriand, in the First Age. He and his people were met by Finrod Felagund, who guided them to settle in Estolad[?] east of Doriath. Bëor himself took service with Felagund in Nargothrond.
Baran the eldest son of Bëor, inherited the leadership.
Bereg, a grandson of Baran, was dissatisfied with Estolad, and led part of the people away to parts unknown.
Boron was a son of Baran.
Boromir was a son of Boron. The later Boromir of Gondor was named after him.
Bregor was a son of Boromir.
Bregolas, who died in the Dagor Bragollach, and Barahir were sons of Bregor.
Beren was a son of Barahir.
Baragund[?] was a son of Bregolas.
