Thea
#353 in the US in 2025
Thea in the United States
Between 2016 and 2025 the name has been steady.
SOURCE·US Social Security Administration, national baby-name data·Public domain. SSA lists a name only if it was given to at least 5 babies of that sex that year.·REVIEWED JUL 2026
Thea in New Zealand
In New Zealand, Thea has been registered 920 times since 2008, peaking in 2019 with 100 births. It ranked #84 for girls in 2025 on 45 births.
SOURCE·NZ Department of Internal Affairs, births by first name·CC BY 4.0. DIA lists a name only if it was given to at least 10 babies of that sex that year.·REVIEWED JUL 2026
Decade by decade in the US
| Year | Rank | Births |
|---|---|---|
| 1880 | #738 | 6 |
| 1890 | #1,006 | 8 |
| 1900 | #1,561 | 7 |
| 1910 | #1,773 | 8 |
| 1920 | #1,666 | 25 |
| 1930 | #1,661 | 23 |
| 1940 | #1,170 | 39 |
| 1950 | #988 | 85 |
| 1960 | #1,043 | 106 |
| 1970 | #1,144 | 101 |
| 1980 | #1,068 | 132 |
| 1990 | #1,219 | 138 |
| 2000 | #1,588 | 111 |
| 2010 | #1,536 | 145 |
| 2020 | #302 | 1,071 |
Where in the United States
The states that registered Thea most often since 1880. These are lifetime totals, so they track state population as much as local taste — a name common in Wyoming will never out-count California.
| State | Births |
|---|---|
| California | 1,742 |
| New York | 1,467 |
| Pennsylvania | 780 |
| Ohio | 760 |
| Texas | 712 |
| Illinois | 693 |
| Minnesota | 580 |
| Florida | 578 |
| Michigan | 528 |
| Washington | 487 |
How these figures are worked out
- Counts come straight from the registrars: the US Social Security Administration (1880–2025) and the New Zealand Department of Internal Affairs (1900–2025). Nothing is scraped from another names site.
- Ranks are computed against every name in that year's file, not just the ones this site publishes pages for — otherwise a rank would flatter every name we happen to list.
- The curve is drawn on births per 100,000 of that sex, not raw counts. Raw counts across eras are misleading: far more births were registered in 1957 than in 1890, so a flat count is a falling share.
- Each country hides small numbers — the US below 5 births a year, New Zealand below 10. A gap in a line is "below the floor", never "nobody".
SOURCE·US SSA (1880–2025) + NZ DIA (1900–2025) birth registrations·ranks and shares computed from the source files, see method·REVIEWED JUL 2026