Kunz is the old German form of the name Konrad, see also under Emperor Conrad I + II, is known as "Hinz and Kunz. This stems from the conflicts between KonradII. and Henry of Saxony, who later became King Henry I. On her death bed to have designated as the successor Conrad II Henry, who was most qualified to be enemies for life in the kingdom.
(Sent from: Günter Grobe)