Proto-Celtic *wroikos

→ Catalan bruc (derived)

→ Catalan brossa (derived)

→ Catalan bruguera (derived)

→ Welsh grug (inherited)

→ Spanish brezo (derived)

→ French bruyère (derived)

→ Irish fraoch (inherited)

→ Scottish Gaelic fraoch (inherited)

→ Galician breixo (derived)

→ Galician broza (mention)

→ Ancient Greek ἐρείκη (cognate)

→ Alemannic German Brüüsch (derived)

→ Italian brughiera (derived)

→ Cornish grug (inherited)

→ Norman brüethe (derived)

→ Occitan bruc (derived)