What does Theta mean?
Theta is an uncommonly occurring first name for women. Theta is an equally unusual surname for both adults and children. (2000 U.S. Census)
Shown below is a comparison of the popularity of Theta and corresponding names. The only prominent varying form of Theta (#unlisted) is Theda. This girl name was at the top of its popularity during the years 1920-1929 and has become significantly less widespread since, with the version Theda becoming less fashionable. (Top 1000 Birth Names Records, 2014)