Gracious
A modern American creation likely blending the prefix 'Ja-' with the name Yvonne or Joanna. It carries the traditional meaning of 'God is gracious' through its linguistic roots in the Hebrew name Yochanan.
Less common today
Javonna isn't in the latest US Top 1000. It last peaked at #2,831 in 1990.
US births per 5-year period, 1990βpresent (SSA data).