Hervart's father Daniel Herwart was a Protestant banker from Augsburg who moved to Lyon.
Other Herwart or Hervart family included Barthélemy's ancestor Georg Herwart who was mayor of Augsburg from 1539 to 1548,[REF] Georg's son Ulrich, who moved to Lyon, and Ulrich's son Daniel who married Anne Erlin in 1599 and had four children, including Barthélemy.