Baby Names US
girls' name ★ peaked 1907

Theta

Gender Girl Rank 2025 Below top lists
Rank 2025
–
among girls
Babies in 2025
<5
named Theta
How common
–
girls born in 2025
Peak year
1907
20 babies
All-time total
402
#13,464 all-time among girls
First recorded
1907
in Social Security records

Theta popularity over time

402 babies have been named Theta since 1907, according to official Social Security records. Switch measure to see births per year or the yearly rank.

Measure
Births per 1,000 babies of that sex, comparable across eras
0.020.040.060.0818801900192019401960198020002020Peak 1907Girls

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade Girls Per year Change Best rank
1880s – – – –
1890s – – – –
1900s 33 3 – #868
1910s 56 6 +70% #1,913
1920s 101 10 +80% #2,181
1930s 84 8 -17% #2,115
1940s 62 6 -26% #3,123
1950s 40 4 -35% #4,599
1960s 21 2 -47% #4,509
1970s – – – –
1980s – – – –
1990s – – – –
2000s – – – –
2010s 5 1 – #18,872
2020s (to 2025) – – – –

The story of Theta

Theta is not currently in use for newborns in the United States: fewer than five babies received the name in 2025. Its story lives in the historical record below.

Since 1907, 402 American babies have been named Theta. Its peak came in 1907, when 20 newborns received the name, the signature sound of the 1900s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Theta stood among all girls' names in any year, or use the compare tool to plot it against other names.

How old are people named Theta?

The median living Theta is about 76 years old; half are between 66 and 84. An estimated 100 people named Theta are alive in the United States today.

median 76 020406080100

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Theta year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year Girls Girls rank
2025 – –
2024 – –
2023 – –
2022 – –
2021 – –
2020 – –
2019 – –
2018 – –
2017 – –
2016 – –
2015 5 #18,872
2014 – –
2013 – –
2012 – –
2011 – –
2010 – –
2009 – –
2008 – –
2007 – –
2006 – –
2005 – –
2004 – –
2003 – –
2002 – –
2001 – –
2000 – –
1995 – –
1990 – –
1985 – –
1980 – –
1975 – –
1970 – –
1965 – –
1960 6 #6,335
1955 – –
1950 7 #4,698
1945 6 #4,511
1940 9 #3,188
1935 14 #2,296
1930 11 #2,826
1925 6 #4,909
1920 – –
1915 – –
1910 7 #2,121
1905 – –
1900 – –
1895 – –
1890 – –
1885 – –
1880 – –

Frequently asked questions

Quick answers about Theta, drawn from the same Social Security data as the charts above.

How old is the average Theta?

The median living Theta is about 76 years old. Half of all living Thetas are between 66 and 84 years old.

How many people named Theta are alive today?

An estimated 100 people named Theta are alive in the United States, based on 402 recorded births and Social Security life tables.

How popular is the name Theta in 2025?

Theta did not appear in the 2025 Social Security data, which means fewer than five babies received the name that year.

How many people are named Theta?

402 babies have been named Theta in the United States since 1907, based on Social Security card applications.

When was the name Theta most popular?

Theta peaked in 1907, when 20 newborns received the name.

Is Theta a boy or girl name?

Theta is overwhelmingly a girl's name: 100% of babies with the name.

Is the name Theta rising or falling?

Theta is declining, less popular now than a decade ago.

Names like Theta

Names that sound and feel close to Theta: shared sounds, similar era, similar popularity. Each links to its full history.

Compare Theta with similar names → More names starting with T →