Gracious
Keshonna is a modern American creation, likely formed by combining the prefix 'Ke-' with the name Shonna. Shonna itself is a variant of Shawna, the feminine form of Sean, which is the Irish version of John, meaning 'God is gracious'.
Less common today
Keshonna isn't in the latest US Top 1000. It last peaked at #7,901 in 1996.
US births per 5-year period, 1990βpresent (SSA data).