Combination of prefix Ta- and the name Shawna
Tashawna is a modern American invention, likely created by blending the popular rhythmic prefix 'Ta-' with the name Shawna. Shawna itself is a feminine form of Sean, which is the Irish cognate of John, ultimately meaning 'God is gracious'.
Less common today
Tashawna isn't in the latest US Top 1000. It last peaked at #2,872 in 1991.
US births per 5-year period, 1990βpresent (SSA data).