Gracious
Geana is a rare variant of Gianna or Jeana, ultimately derived from the Hebrew name Yochanan. It signifies the belief that God has been gracious in granting a child. While it shares roots with Jane and Joan, this specific spelling is quite uncommon in the United States.
Less common today
Geana isn't in the latest US Top 1000. It last peaked at #8,889 in 1992.
US births per 5-year period, 1990βpresent (SSA data).