Unknown; possibly a modern blend or feminine form of Terry
Terrica is a modern American invention, likely created by combining the name Terry with the popular suffix '-ica'. While its exact etymology is not documented, it often functions as a feminine elaboration of Terence or Theodore, or a variation of the name Erica. It rose to modest use in the late 20th century but remains a rare choice today.
Less common today
Terrica isn't in the latest US Top 1000. It last peaked at #2,005 in 1990.
US births per 5-year period, 1990βpresent (SSA data).