Welsh llythyr

← Proto-Brythonic *llɨθer (inherited)

← Middle Cornish lyther (cognate)

← Latin littera (derived)

← Old Welsh leder (inherited)

← Old Irish liter (cognate)

← Middle Welsh llythyr (inherited)

← Middle Breton lizer (cognate)

→ Welsh llythyren (affix)

→ Welsh llythyron (affix)

→ Welsh llythyrau (affix)

→ Welsh cylchlythyr (affix)