Proto-Celtic *birros

→ English beret (derived)

→ English birrus (derived)

→ Arabic برنس (derived)

→ Breton berr (inherited)

→ Welsh byr (inherited)

→ Spanish birrete (derived)

→ French béret (derived)

→ Irish bairéad (derived)

→ Ancient Greek βίρρος (derived)

→ Cornish berr (inherited)

→ Old Irish berr (inherited)