Earth or land
Tierria is a modern American elaboration of the Spanish word 'tierra', which translates directly to earth or land. It likely emerged as a creative variant of names like Tierra or Tiara, blending a natural meaning with a rhythmic, feminine suffix.
Less common today
Tierria isn't in the latest US Top 1000. It last peaked at #10,091 in 1996.
US births per 5-year period, 1990βpresent (SSA data).