Proto-Celtic *brigantīnos

→ English Brendan (derived)

→ Welsh brenin (inherited)

→ Irish Breandán (derived)

→ Irish Bréanainn (derived)

→ Galician bren (derived)

→ Galician Bergantiños (derived)

→ Galician Brandán (derived)

→ Ancient Greek Βρέννος (derived)

→ Middle Welsh brenhin (inherited)