Thea has been given to about 20,118 people in the United States since 1880. It was most common in 2018, which makes it a current name.
Thea ranks 353rd among American girls in 2025, with 867 born that year. Its best year was 2018, when 1,209 babies were given the name, ranking 273rd. The typical living American called Thea is about 9 years old today. It is relatively most common in District of Columbia, where it accounts for 0.13% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.