Three; or a combination of Tre and Anna
Treanna is most often used as a modern American blend of the prefix Tre, meaning three, and the classic name Anna, meaning grace. It may also be used as a variant of Tiana or Brianna. Its usage is rare, often chosen for its rhythmic, three-syllable sound.
Less common today
Treanna isn't in the latest US Top 1000. It last peaked at #5,055 in 1998.
US births per 5-year period, 1990βpresent (SSA data).