Gracious
Janisa is a modern American elaboration of Jane or Janice, combining the traditional root with the popular '-isa' suffix. It ultimately derives from the Hebrew name Yochanan, meaning 'God is gracious'.
Less common today
Janisa isn't in the latest US Top 1000. It last peaked at #5,613 in 1993.
US births per 5-year period, 1990βpresent (SSA data).