Hi..
On the net I came across...
http://home.tiscali.nl/~wr2777/Quade-Origin.htm
excerpt...
An early bearer of the name 'Quade' was Otto 'der Quade'. He was Duke of Braunschweig-G�ttingen, Germany. He was born about 1340 in G�ttingen, Hannover, Prussia.....
Barbie