The Dearinger DNA indicates a close relationship to this line.
Here are some examples of the variations that have ocurred in the spelling of this name: Duering, During, Dueringe, Dueringen, Duehring, Duhring, Döring, Doring, Doehring, Duehrig, Duerich, Doerich, Dieruich, Dieringer, Diericke, Dierecke, Doringk, Doeringk, Duhringer, Duringer, Doringer, Doeringer, and von Döering.
Doering is an ethnic name for someone from Thuringia (German Thüringen). The region is thus named because its former occupation by the Thuringii, a Germanic tribe. Von Doering is from a personal name based on cognate of turren "to dare".
Information from http://www.angelfire.com/mi4/polcrt/vonDoering.html