How Many People Are Named Sebastain?
An estimated 484 people in the United States have the first name Sebastain. It is almost exclusively a male name. The average bearer is 23 years old, and Sebastain peaked in popularity in 2002 with 24 births that year.
Below you will find a full statistical profile of Sebastain 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 Sebastain paired with any surname.
Estimated Living Americans
484
About 1 in 708,170 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
23
years old
Peak Year
2002
24 births
Total Registered
500
since 1880
Gender Distribution for Sebastain
Sebastain is almost exclusively a male name. Out of 500 total births registered, 100.0% were male.
Sebastain as a male name
Ranked #10,701 in 2024
7 male births in 2024
Peak: 2002 (24 births)
Sebastain in the 2020 Census
The 2020 Census recorded 572 people with the first name Sebastain, which placed it at #18,739 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, Sebastain was recorded as predominantly male. Out of 572 people with this name in that snapshot, 100.0% were male and 0.0% were female. That is very close to the long-run birth pattern in SSA records, where the name is male 100.0% of the time.
Census Count
572
people with this name
Census Rank
#18,739
among Census first names
Frequency Rate
0.19
per 100,000 people
Recorded Race and Hispanic Origin in the 2020 Census
In the 2020 Census, the first name Sebastain was most commonly recorded among people who identified as Hispanic (44.41%). The next largest recorded groups were White (37.94%) and Black (10.14%).
These percentages describe the people who had the first name Sebastain 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 Sebastain.
| Group | Share | Count |
|---|---|---|
| Hispanic | 44.41% | 254 |
| White | 37.94% | 217 |
| Black | 10.14% | 58 |
| Two or More Races | 5.24% | 30 |
| American Indian and Alaska Native | 1.22% | 7 |
| Asian and Pacific Islander | 1.05% | 6 |
Sebastain: Popularity Over Time
SSA records for Sebastain span from the 1910s to the 2020s, covering 8 decades of naming data. The most popular decade for this name was the 2000s, when 176 babies were registered. Sebastain has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Sebastain by Decade
How has Sebastain 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.
Sebastain by State
Sebastain + Last Name Combinations
How many people share a full name with Sebastain as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Sebastain
Other first names starting with S with a similar number of bearers.
Sebastain: Questions and Answers
How many people in the U.S. are named Sebastain?
We estimate approximately 484 people named Sebastain 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 708,170 Americans share this first name.
Is Sebastain a common name?
Sebastain is classified as "Very Rare" and is more popular than 84.3% of all first names in the SSA database. A total of 500 births have been registered with this name since 1880.
When was Sebastain most popular?
Sebastain reached peak popularity in 2002, when 24 babies were given this name. The average age of a living person named Sebastain is approximately 23 years old, reflecting when the name was most commonly given.
How common was Sebastain in the 2020 Census?
The 2020 Census recorded 572 people with the first name Sebastain. That placed it at #18,739 in the published Census first-name tables, or 0.19 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 Sebastain 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 Sebastain?
In the 2020 Census snapshot, Sebastain was recorded as predominantly male. The published split was 100.0% male and 0.0% female.
What does the Census say about the background of people named Sebastain?
In the 2020 Census, the first name Sebastain was most commonly recorded among people who identified as Hispanic (44.41%). The next largest recorded groups were White (37.94%) and Black (10.14%). 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 Sebastain a male name?
Sebastain is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
Why can Sebastain 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. Sebastain peaked in 2002, and the average living bearer is about 23 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
How many Sebastain Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Sebastain Smith, Sebastain Johnson, Sebastain 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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