He came from a famous family of theologians who were originally named Hoeck or Hoch but Franz's great-grandfather had changed the family name to its Greek form.
Siya ay nagmula sa isang tanyag na pamilya ng mga theologians na ang orihinal na pinangalanang Hoeck o Hoch ngunit Franz's lolo sa tuhod ay binago ang pangalan ng pamilya sa kanyang Greek form.