Welsh -iol

← Proto-Brythonic *-ǫl (inherited)

← Proto-Celtic *-ālos (inherited)

← Latin -ālis (derived)

← Middle Welsh -awl (inherited)

→ Welsh cyfriniol (affix)

→ Welsh doniol (affix)

→ Welsh gwreiddiol (affix)

→ Welsh ffurfiol (suffix)

→ Welsh amrywiol (affix)

→ Welsh naturiol (affix)

→ Welsh meintiol (affix)

→ Welsh rheidiol (affix)

→ Welsh gwyrthiol (affix)

→ Welsh siriol (affix)

→ Welsh cydseiniol (affix)

→ Welsh anobeithiol (affix)

→ Welsh gobeithiol (affix)

→ Welsh cynrychioli (suffix)

→ Welsh rhithiol (suffix)

→ Welsh buddiol (affix)

→ Welsh effeithiol (affix)