Harvester or late summer; combination of Terri and Anna
Terriana is a modern American blend, likely combining the name Terri, a diminutive of Theresa meaning 'harvester', with the classic suffix -ana, meaning 'grace'. It follows the 20th-century trend of creating melodic, multi-syllabic names by adding feminine endings to established shorter names.
Less common today
Terriana isn't in the latest US Top 1000. It last peaked at #3,461 in 2003.
US births per 5-year period, 1990βpresent (SSA data).