Welsh chwech

← Proto-Brythonic *hwex (inherited)

← Proto-Celtic *swexs (inherited)

← Proto-Indo-European *swéḱs (inherited)

→ Welsh lle chwech (compound)

→ Welsh chweched (affix)

→ Welsh chweugain (compound)

→ Welsh chwech ar hugain (compound)

→ Welsh un deg chwech (compound)

→ Welsh dau ddeg chwech (compound)