Here's a goodie.
It's plausible (or at least fun to consider the plausibility) that my wife Erika Gantz (and our children) could be related to Knight Carl von Gantzhofen. As a serf, Carolus became acquainted about 918 A.D. with Hatto, the Archbishop of Mainz and the only central authority in the East Frankish Kingdom of the Empire. Due to the influence of Hatto and his assoication with King Henry I, Carolus was given his freedom, and joined battle for King Henry I.
In 921 A.D. Carolus was AWARDED the status of SQUIRE by Henry, and presumed to have achieved KNIGHTHOOD, then to be known as Carl von Gantzhofen. Carl's son Heinrich was awarded a fief by Henry's son and heir, King Otto I. Heinrich Gantz von Gantzhofen named the new castle and town Ottsburg (Otzberg Castle) after the emperor.
The Gantz lineage continued here and in this region, with records, into the 18th century. The direct connection is fouled by uncertainty about which of two Gantz's in the mid 17th century her line descended from to establish Erika's possible connection to the Otzberg Castle folks of the mid 14th century, and the lineage of these Gantz's to the serf Carolus. Drat on a missing record (or so)!