The ruins of Gräfenstein Castle are located near the German village of Merzalben. The Berger family that settled in Seelmann is said to come from Grävenstein - perhaps they came from near this place.
Names
Gräfenstein Castle, Kr. Südwestpfalz, Rheinland-Pfalz
Surnames
Gräfenstein Castle near Merzalben (2015).
Source: Gerd Eichmann via Wikipedia Commons.