Welsh dwrn

← Breton dorn (cognate)

← Proto-Celtic *durnos (inherited)

← Old Irish dorn (cognate)

→ Breton dorn (cognate)

→ Welsh dyrnau (affix)

→ Welsh cildwrn (affix)

→ Welsh arddwrn (prefix)

→ Welsh dyrnaid (affix)

→ Welsh dyrnfedd (affix)

→ Welsh dyrnu (affix)

→ Irish dorn (cognate)

→ Scottish Gaelic dòrn (cognate)

→ Cornish dorn (cognate)