Welsh llyfr

← Proto-Brythonic *llɨvr (inherited)

← Latin liber (derived)

← Middle Welsh llyuyr (inherited)

→ Breton levr (cognate)

→ Welsh llyfrgell (compound)

→ Welsh llawlyfr (affix)

→ Welsh dyddlyfr (compound)

→ Welsh llyfrau (affix)

→ Welsh cyfriflyfr (affix)

→ Welsh gwerslyfr (affix)

→ Welsh deddflyfr (affix)

→ Welsh e-lyfr (affix)

→ Welsh Gweplyfr (compound)

→ Cornish lyver (cognate)