An Etymological Dictionary of the German Language/Horn
Horn, n., ‘horn, peak,’ from the equiv. MidHG. and OHG. horn, n.; comp. Goth. haúrn, OIc. horn, AS. and E. horn, OFris. horn, Du. horen; a common Teut. word for ‘horn,’ cognate with Lat. cornu, and Ir., W., and Corn. corn (κάρνον την σάλπιγγα Τάλατας, Hesychius); allied to Gr. κέρ-ας, ‘horn,’ with a different suffix (comp. also Teut. Hirsch, lit. ‘horned animal’), as well as the equiv. Sans. çrñ-ga. See further respecting the Aryan root ker under Hirn. Comp. Hahnrei.