An Etymological Dictionary of the German Language/Herzog

by Friedrich Kluge

Herzog, m., ‘duke,’ from the equiv. MidHG. hęrzoge, OHG. hęrizogo (-zoho), m.; comp. OSax. hęritogo, AS. hęretoga, m., OIc. hertoge, m.; a common Teut. term for ‘the leader of an army,’ in which zoho, zogo, allied to ziohan (as togo to tiuhan), has the old meaning ‘leader.’ Comp. ziehen.