Spanish brezo

← Proto-Celtic *wroikos (derived)

← Czech vřes (cognate)

← Welsh grug (cognate)

← Irish fraoch (cognate)

← Ancient Greek ἐρείκη (cognate)

← Latvian virsis (cognate)

← Old Irish froech (cognate)

← Proto-Slavic *versъ (cognate)

→ Spanish brezal (affix)

→ Alemannic German Brüüsch (cognate)