How Common Is the Last Name Sierra?
An estimated 41,211 people in the United States share the surname Sierra. That's about 1 in 8,317 Americans. This data comes from the 2020 U.S. Census Bureau surname frequency tables.
This page covers the Sierra surname's frequency in the U.S. population, its rank among all American surnames, and a breakdown of ancestry and ethnicity data from the Census. You can also check how many people share any first + last name combination involving Sierra.
Estimated Americans with this Surname
41,211
About 1 in 8,317 people in the U.S.
Census Rank
#957
Frequency Rate
12.02
per 100,000 people
Census Count
35,938
2020 Census
Data Source
2020
U.S. Census Bureau
Ancestry and Ethnicity for Sierra
The Sierra surname is most commonly associated with people who identify as Hispanic (90.49%). The next largest groups are White (7.05%) and Asian/Pacific Islander (0.82%).
Self-reported race and ethnicity from the 2020 U.S. Census Bureau surname tables. Some categories may be suppressed for privacy when sample sizes are small.
Historical Census Data for Sierra
Sierra appears in 3 published Census surname releases on this site (2000, 2010, 2020). From 2000 to 2020, the raw count became more common and the per-100,000 rate became more common. Its best published rank was #957 in 2020.
Between the 2010 and 2020 census releases, more people were recorded with the surname Sierra, but it became a smaller share of the U.S. population overall. In other words, the raw count went up, while the frequency per 100,000 went down.
The line to watch most closely is per 100,000 people. That adjusts for overall population growth, so it shows whether Sierra became a bigger or smaller share of the country, not just whether the raw count went up.
Census Count Over Time
Raw Census count in each published surname release.
26,181 to 35,938
Per 100,000 Over Time
Population-adjusted frequency, which is usually the cleaner trend line.
9.71 to 12.13
Release-by-release summary
Each row is a published Census surname table for Sierra. The change column compares each release to the one before it.
| Year | Rank | Count | Per 100K | Change vs prior release | Largest recorded group |
|---|---|---|---|---|---|
| 2000 | #1,227 | 26,181 | 9.71 | Baseline release | Hispanic (89.01%) |
| 2010 | #973 | 35,770 | 12.13 |
Count 30.96%
Rate 22.16% | Hispanic (90.56%) |
| 2020 Latest | #957 | 35,938 | 12.02 |
Count 0.47%
Rate -0.88% | Hispanic (90.49%) |
If the raw count rose but the per-100,000 number fell, the surname still became less common relative to the size of the U.S. population. That is why the frequency rate usually tells the clearer story.
Recorded ancestry change
These percentages show how the Census profile for this surname shifted across the published surveys on this site.
| Ancestry | 2020 | 2010 | 2000 | Change Since 2000 |
|---|---|---|---|---|
| White | 7.05% | 7.23% | 8.55% | -19.29% |
| Black | 0.71% | 0.74% | 0.85% | -17.62% |
| Asian and Pacific Islander | 0.82% | 0.64% | 0.52% | 44.23% |
| American Indian and Alaska Native | 0.54% | 0.51% | 0.53% | 2.35% |
| Two or More Races | 0.40% | 0.32% | 0.54% | -30.30% |
| Hispanic | 90.49% | 90.56% | 89.01% | 1.65% |
These percentages come from self-reported Census data. They describe how the recorded makeup of people using the surname Sierra changed from 2000 through 2020, not the deeper family origin of every bearer of the name.
First Name + Sierra Combinations
How many people share a full name with Sierra as the last name? Click a combination below to see the estimate, or search any pairing.
Sierra Surname: Questions and Answers
How common is the last name Sierra?
Sierra is the #957 most common surname in the United States, with an estimated 41,211 people sharing this last name. It appears at a rate of 12.02 per 100,000 Americans.
Has the surname Sierra become more or less common over time?
In the published Census surname tables on this site, Sierra moved from 26,181 people in 2000 to 35,938 in 2020. The more important line is the population-adjusted rate, which changed from 9.71 to 12.02 per 100,000.
Why can the raw count go up while the rate per 100,000 goes down?
Because the total U.S. population can grow faster than the surname itself. A surname can have more people in absolute numbers but still make up a smaller share of the country, which is why the per-100,000 figure often tells the clearer story.
What does the ancestry change table show for Sierra?
It compares the published Census demographic mix for Sierra across releases on this page. That helps you see whether the recorded share of the surname shifted between groups over time, but it still does not tell the full family history of every person with the name.
What does 12.02 per 100,000 mean?
It means that if you picked 100,000 people in the United States at random, about 12.02 of them would have the surname Sierra. This is usually the clearest way to compare surnames because it adjusts for the size of the total population.
What ethnicity is the surname Sierra?
The Sierra surname is most commonly associated with people who identify as Hispanic (90.49%). The next largest groups are White (7.05%) and Asian/Pacific Islander (0.82%). This data comes from the 2020 U.S. Census Bureau surname tables, which include self-reported race and ethnicity breakdowns.
Does the ancestry table tell the exact family origin of everyone named Sierra?
No. It shows how people with the surname Sierra identified in the Census. That is useful context, but it does not prove the deeper family history, nationality, or origin story of every person with the name.
How many people named [First Name] Sierra are there?
We can estimate any first + last name combination. Popular examples: Michael Sierra, James Sierra, John Sierra. Search any combination on our homepage.
Where does this surname data come from?
Surname frequency data comes from the 2020 U.S. Census Bureau decennial surname tables. These list every surname appearing in the Census along with frequency rates and demographic breakdowns. Full methodology.
Search for a full name combination
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