Gracious
A modern American elaboration of Jane or Jan, combining the roots of Jane with the popular 'essa' suffix. It ultimately derives from the Hebrew name Yochanan, meaning 'God is gracious'.
Less common today
Jannessa isn't in the latest US Top 1000. It last peaked at #7,182 in 2009.
US births per 5-year period, 1990βpresent (SSA data).