Breton yezh

← Proto-Brythonic *jeiθ (inherited)

← Proto-Celtic *yextis (inherited)

← Middle Breton yez (inherited)

→ English joke (cognate)

→ Breton yezhadur (affix)

→ Breton divyezhek (confix)

→ Breton yezhoniezh (mention)

→ Welsh iaith (cognate)

→ Latin iocus (cognate)