An Etymological Dictionary of the German Language/fordern

by Friedrich Kluge

fordern, vb., from the equiv. MidHG. vordern, OHG. fordarôn, ‘to demand, request, challenge, summon’; corresponding to Du. vorderen; a specifically Ger. form, orig. unknown to the other dialects, yet the word found its way from Ger. into Dan. and Swed. It is a derivative of vorder.