Gracious
Jantz is a Germanic surname-turned-given name, derived from Janz or Jans, which are patronymic forms of Jan. It ultimately traces back to the Hebrew name Yochanan, meaning 'God is gracious'. While rare as a first name, it follows the trend of using sharp, consonant-heavy surnames for boys.
Less common today
Jantz isn't in the latest US Top 1000. It last peaked at #7,760 in 2012.
US births per 5-year period, 1990βpresent (SSA data).