From the mid-1600s to the present, members of the Klotz (or Kloz) family have made violins in Mittenwald, Germany. Dictionaries of violin makers list more than 25 by this name.
Matthias I (1656-1743) founded the Mittenwald school of violin making after study with Jacob Stainer and Nicolo Amati.
Typical labels:
Mattias Klotz Geigenmacher zu Mittenwald an der Iser 1697
Mathias Klotz Lauten und Geigenmacher in Mittenwald an der Iser Anno 1695