Follower of Christ or heavenly
Tiannah is a modern elaboration of Tiana, which itself is a diminutive of Christiana or Tatiana. It carries the Christian association of being a follower of Christ, while its phonetic similarity to the word 'titan' or 'sky' in some contexts lends it a celestial feel.
Less common today
Tiannah isn't in the latest US Top 1000. It last peaked at #5,067 in 2007.
US births per 5-year period, 1990–present (SSA data).
