How Many People Are Named Cynthia?
An estimated 542,980 people in the United States have the first name Cynthia. While not in the top 50, it remains a well-known name ranking #76 overall. It is almost exclusively a female name. The average bearer is 60 years old, and Cynthia peaked in popularity in 1957 with 39,416 births that year. It has a similar number of bearers to Nathan (541,143).
Below you will find a full statistical profile of Cynthia as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, state-by-state birth registrations, and, when available, a 2020 Census snapshot showing who had the name at that point in time. You can also check how many people share the full name Cynthia paired with any surname.
Key Insights
- While Cynthia is overwhelmingly female, 1,960 male births have been registered with this name since 1880.
- Cynthia has fallen dramatically from its peak in the 1950s. Recent registrations are less than 5% of what they were at the name's height.
Estimated Living Americans
542,980
About 1 in 631 people in the U.S.
Rarity
Very Common
Predicted Gender
Female
99.7% confidence
Average Age
60
years old
Peak Year
1957
39,416 births
Total Registered
713,161
since 1880
Gender Distribution for Cynthia
Cynthia is almost exclusively a female name. Out of 713,161 total births registered, 99.7% were female.
Cynthia as a male name
Ranked #11,224 in 2003
5 male births in 2003
Peak: 1957 (76 births)
Cynthia as a female name
Ranked #826 in 2024
331 female births in 2024
Peak: 1957 (39,340 births)
Cynthia in the 2020 Census
The 2020 Census recorded 597,780 people with the first name Cynthia, which placed it at #71 in the published first-name tables. This is a snapshot of people who already had the name in 2020. The estimated living count elsewhere on this page is different: it is a current estimate built from SSA birth records and age-based survival rates, so the two figures are not expected to match exactly.
Read this section as a snapshot of people who already had the name in 2020. The SSA charts elsewhere on this page are still the better way to see how the name rose, fell, or shifted across generations.
Gender in the 2020 Census
In the 2020 Census, Cynthia was recorded as predominantly female. Out of 597,780 people with this name in that snapshot, 0.1% were male and 99.9% were female. That is very close to the long-run birth pattern in SSA records, where the name is female 99.7% of the time.
Census Count
597,780
people with this name
Census Rank
#71
among Census first names
Frequency Rate
197.92
per 100,000 people
Recorded Race and Hispanic Origin in the 2020 Census
In the 2020 Census, the first name Cynthia was most commonly recorded among people who identified as White (69.48%). The next largest recorded groups were Hispanic (14.15%) and Black (11.38%).
These percentages describe the people who had the first name Cynthia in the 2020 Census. They do not tell you the deeper meaning or origin of the name itself.
2020 Census demographic breakdown
Each row shows a recorded Census category for people with the first name Cynthia.
| Group | Share | Count |
|---|---|---|
| White | 69.48% | 415,350 |
| Hispanic | 14.15% | 84,577 |
| Black | 11.38% | 68,037 |
| Two or More Races | 2.28% | 13,647 |
| Asian and Pacific Islander | 2.16% | 12,921 |
| American Indian and Alaska Native | 0.54% | 3,245 |
The Census published separate sex and race/origin tables for first names, so their total counts can differ slightly for the same name. That is why the race section focuses on the demographic mix rather than repeating a second headline count.
Cynthia: Popularity Over Time
SSA records for Cynthia span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 1950s, when 263,890 babies were registered. Cynthia has declined significantly from its peak in the 1950s. Recent registrations are a fraction of what they were at the name's height.
Cynthia by Decade
How has Cynthia tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
| Decade | Total | Male | Female | |
|---|---|---|---|---|
| 1880s | 582 | 0 | 582 | |
| 1890s | 701 | 0 | 701 | |
| 1900s | 694 | 0 | 694 | |
| 1910s | 1,911 | 0 | 1,911 | |
| 1920s | 3,661 | 0 | 3,661 | |
| 1930s | 9,695 | 29 | 9,666 | |
| 1940s | 58,206 | 146 | 58,060 | |
| 1950s | 263,890 | 461 | 263,429 | |
| 1960s | 197,149 | 553 | 196,596 | |
| 1970s | 80,533 | 333 | 80,200 | |
| 1980s | 41,936 | 269 | 41,667 | |
| 1990s | 31,470 | 158 | 31,312 | |
| 2000s | 15,181 | 11 | 15,170 | |
| 2010s | 5,945 | 0 | 5,945 | |
| 2020s | 1,607 | 0 | 1,607 | |
Cynthia by State
Birth registrations for Cynthia span all 51 states and territories in the SSA database. The highest counts are in California, Texas, New York. The lowest are in Wyoming, Alaska, Vermont. On average, about 13,871 Cynthias were registered per state.
Cynthia + Last Name Combinations
How many people share a full name with Cynthia as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Cynthia
Other first names starting with C with a similar number of bearers.
Cynthia: Questions and Answers
How many people in the U.S. are named Cynthia?
We estimate approximately 542,980 people named Cynthia are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 631 Americans share this first name.
Is Cynthia a common name?
Cynthia is classified as "Very Common" and is more popular than 99.9% of all first names in the SSA database. A total of 713,161 births have been registered with this name since 1880.
When was Cynthia most popular?
Cynthia reached peak popularity in 1957, when 39,416 babies were given this name. The average age of a living person named Cynthia is approximately 60 years old, reflecting when the name was most commonly given.
How common was Cynthia in the 2020 Census?
The 2020 Census recorded 597,780 people with the first name Cynthia. That placed it at #71 in the published Census first-name tables, or 197.92 people per 100,000.
Why is the Census count different from the living estimate?
Because they measure different things. The Census number is a count of people with the name in 2020. The living estimate is a current model based on SSA birth records and survival rates, so it aims to estimate how many people with the name are alive now.
What does the SSA popularity chart show?
The popularity chart tracks birth registrations, not people currently alive. It shows how often Cynthia was given to babies from 1880 through 2024, which is why it is the best tool on the page for seeing long-run naming trends.
What does the Census say about the gender split for Cynthia?
In the 2020 Census snapshot, Cynthia was recorded as predominantly female. The published split was 0.1% male and 99.9% female.
What does the Census say about the background of people named Cynthia?
In the 2020 Census, the first name Cynthia was most commonly recorded among people who identified as White (69.48%). The next largest recorded groups were Hispanic (14.15%) and Black (11.38%). These percentages describe the people who had the name in the 2020 Census, not the deeper meaning or origin of the name itself.
Why can the Census sex total and race total differ slightly?
The Census published separate first-name tables for sex and for race and Hispanic origin. Those totals can differ slightly for the same name, so the page uses them as two related snapshots rather than treating them as perfectly interchangeable counts.
Does every first name have Census demographic data?
No. The public Census first-name tables only include names that met the Bureau's publication rules. That means some names on this site will have SSA history but no published Census demographic snapshot.
Is Cynthia a female name?
Cynthia is predominantly female. 99.7% of people with this name are female. See the gender breakdown above for full details.
Why can Cynthia have a lot of living bearers even if it is not trendy now?
Because a name can build up a large population over many decades. Cynthia peaked in 1957, and the average living bearer is about 60 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
How many Cynthia Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Cynthia Smith, Cynthia Johnson, Cynthia Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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