Welsh hedd

← Breton hez (cognate)

← Proto-Celtic *sedom (inherited)

← Proto-Indo-European *sed- (inherited)

← Old Irish síd (cognate)

→ Welsh annedd (mention)

→ Welsh heddlu (compound)

→ Welsh heddwas (compound)

→ Welsh heddwch (suffix)

→ Welsh heddferch (compound)

→ Old Irish síd (cognate)