Welsh haearn

← Breton houarn (cognate)

← Proto-Brythonic *hiyarno- (inherited)

← Proto-Celtic *īsarnom (inherited)

← Irish iarann (cognate)

← Proto-Indo-European *h₁ésh₂r̥ (inherited)

← Cornish horn (cognate)

← Middle Welsh haearn (inherited)

→ Old English isern (cognate)

→ Breton houarn (cognate)

→ Welsh ffordd haearn (affix)

→ Irish iarann (cognate)

→ Scottish Gaelic iarann (cognate)

→ Manx yiarn (cognate)

→ Old Irish íarn (cognate)

→ Albanian Erjon (cognate)