French rêne

← Catalan regna (cognate)

← Spanish rienda (cognate)

← Old French resne (inherited)

← Galician renda (cognate)

← Italian redine (cognate)

← Latin retineō (inherited)

← Portuguese rédea (cognate)

→ English rein (cognate)

→ Catalan regna (cognate)

→ Spanish rienda (cognate)

→ French enrêner (confix)

→ Portuguese rédea (cognate)