Welsh broch

← Proto-Brythonic *brox (inherited)

← Proto-Celtic *brokkos (inherited)

→ English brock (cognate)

→ Old English brocc (cognate)

→ Welsh brochion (affix)

→ Welsh brochod (affix)

→ Irish broc (cognate)

→ Manx broc (cognate)

→ Middle Irish brocc (cognate)