The family name Bock can be found in the works of Wiel S. van Dinter De Joden van Gennep (Zutphen, 1990) p. 48-51
Addition
The family name Bock can be found in the works of Wiel S. van Dinter De Joden van Gennep (Zutphen, 1990) p. 48-51