Gracious
Keshauna is a modern American creation, likely formed by combining the popular prefix 'Ke-' with the name Shauna. Shauna itself is a feminine form of Shaun, which is the Irish variation of John, ultimately meaning 'God is gracious'.
Less common today
Keshauna isn't in the latest US Top 1000. It last peaked at #5,555 in 1999.
US births per 5-year period, 1990βpresent (SSA data).