Unknown; possibly a variant of Tania or Tiana
The exact etymology of Tnia is unclear, as it is a very rare contemporary name. It is most likely a creative modern spelling or a shortened variant of names like Tania, which is a Russian diminutive of Tatiana, or Tiana, which has roots in Latin and Greek. Due to its rarity, it lacks a singular established historical meaning.
Less common today
Tnia isn't in the latest US Top 1000. It last peaked at #10,936 in 2002.
US births per 5-year period, 1990βpresent (SSA data).