Family name origins & meanings
- German : nickname for a clumsy, awkward man, from Middle High German klotz ‘lump’, ‘block’, cognate with modern English clot, which is similarly used in a transferred sense to denote a stupid person.
- Jewish (Ashkenazic) : cognate of 1, from modern German Klotz ‘lump’, ‘block’, or Yiddish klots.