How common your name is comes down to two separate counts. The Census Bureau tallies the last names, and in its newest release the first names, of people counted in the census, while the Social Security Administration (SSA) tallies the first names given to babies born in the US. Neither agency publishes a count of people who share a whole first and last name, so every answer to “how many people have my name” is an estimate: the number of people with your last name times the share of people with your first name. For James Smith that comes to roughly 31,000 people. For a rare surname it can round to one.
Below are the official counts, three worked examples and the reasons the result is rough. To run your own numbers, skip to looking up your names in the official data; to tell yourself apart from people who share your name, use the namesake checklist.
Where the numbers come from: Census and Social Security name data
Last names, and now first names: the Census Bureau. The bureau has counted surnames in every census since 1990. Its 2010 list holds 162,253 surnames, each reported at least 100 times, and its 2010 surname page prints the counts for the top ten. On April 14, 2026, it published names from the 2020 Census: 156,621 last names and 53,615 first names, again limited to names reported 100 or more times. It is the first census since 1990 to provide first names, and its counts come as downloadable spreadsheets rather than on the page itself.
First names: Social Security. SSA counts the first names on Social Security card applications for babies born in the 50 states and DC since 1880. Its notes on the data say that names given to fewer than five babies in a year are left out to protect privacy, that different spellings are not combined, and that many people born before 1937 never applied for a card, so they are missing from the counts.
Neither counts full names. The 2020 Census files hold no first-and-last-name combinations, the bureau says in its release, and SSA’s files cover first names only. Neither agency publishes a figure for your full name, so the only route to one is an estimate.
| Question | Census Bureau | Social Security (SSA) |
|---|---|---|
| Which names | Last names since the 1990 Census; first names from the 1990 and 2020 Censuses | First names |
| Whose names | People counted in the census, of all ages | Babies born in the 50 states and DC who got a Social Security card |
| Newest data | 2020 Census, released April 2026 | Births through 2025, as of March 2026 |
| Names left out | Names reported fewer than 100 times | Names given to fewer than five babies in a year |
| Counts of full names | No | No |
The most common last names and first names in the US
Surnames barely move. Eight of the 15 most common surnames in the 1790 census, among them Smith, Johnson, Williams, Brown and Jones, were still in the top 15 in 2020, after the population grew more than 84-fold, according to the bureau’s story on the 2020 names. Between 2010 and 2020 the top 15 kept their places, except that Rodriguez rose to eighth and Davis slipped to ninth.
| Last name | People, 2010 Census | Rank in 2010 | Rank in 2020 |
|---|---|---|---|
| Smith | 2,442,977 | 1 | 1 |
| Johnson | 1,932,812 | 2 | 2 |
| Williams | 1,625,252 | 3 | 3 |
| Brown | 1,437,026 | 4 | 4 |
| Jones | 1,425,470 | 5 | 5 |
| Garcia | 1,166,120 | 6 | 6 |
| Miller | 1,161,437 | 7 | 7 |
| Davis | 1,116,357 | 8 | 9 |
| Rodriguez | 1,094,924 | 9 | 8 |
| Martinez | 1,060,159 | 10 | 10 |
The 2020 ranks come from the bureau’s “Then and Now” chart; the 2020 counts are in the spreadsheets on its 2020 names page.
Women’s first names are spread more thinly than men’s. Among people counted in 2020, the five most common first names were Michael, John, James, David and Robert, all traditionally male even though women outnumbered men. “Sixteen percent of men have the top 10 male names,” Joshua Comenetz, who wrote the bureau’s 2020 name briefs, said in its story on the release. “For women, it’s only a little under 8%.”
How to estimate how many people have your name
The textbook estimate multiplies three numbers: the share of people with your first name, the share with your last name, and the population. The last two together are simply the number of people with your surname, which the Census Bureau publishes, so the working version is shorter:
People with your last name × share of people with your first name ≈ people with your full name.
That holds only if families with your surname choose first names the way everyone else does, and if both numbers describe the same people at the same time. Neither is quite true, so the answer is an estimate. So are the answers from online “how many of me” calculators, which run versions of the same multiplication.
Worked examples: three names, step by step
These examples use only figures printed on census.gov and ssa.gov: surname counts from the 2010 Census, and first-name shares of the 354,273,778 babies born from 1926 through 2025 in SSA’s 100-year table (180,126,408 boys and 174,147,370 girls). Results are rounded to two significant figures; the inputs can’t support more.
| Full name | People with the last name, 2010 | First-name share of births, 1926–2025 | Estimate |
|---|---|---|---|
| James Smith | 2,442,977 | 4,505,076 ÷ 354,273,778 = 1.27% | About 31,000 |
| Mary Johnson | 1,932,812 | 2,845,637 ÷ 354,273,778 = 0.803% | About 16,000 |
| Maria Garcia | 1,166,120 | 533,465 ÷ 354,273,778 = 0.151% | About 1,800 |
James Smith. Smith is the most common surname and James the most common boys’ name of the past century: 2,442,977 × 0.0127 ≈ 31,000, or about 600 per state if they were spread evenly.
Mary Johnson. 1,932,812 × 0.00803 ≈ 16,000, spread very unevenly across generations, as the next section shows.
Maria Garcia. 1,166,120 × 0.00151 ≈ 1,800, but read it with care: the multiplication treats the two names as unrelated, and SSA’s counts leave out everyone born abroad. If Maria is more common among Garcias, or among people born abroad, than in SSA’s birth data, the real number is higher.
A rare surname. The Census lists stop at 100 people. A surname right at that cutoff, paired even with James, gives 100 × 0.0127 ≈ 1, perhaps just you. Below the cutoff there is no count to multiply, so a calculator that reports zero is telling you your name isn’t in the data, not that no one else has it.
Why the estimate is rough
First names follow birth years. SSA notes that James, first over the past century, has ranked as low as 19th in single years. Mary was given to 625,606 girls in the 1950s, more than any other girls’ name, but to 25,693 in the 2010s, when it ranked 127th, according to SSA’s tables for the 1950s and the 2010s. Linda, second in the 1950s with 564,364 girls, isn’t in the 2010s top 200 at all.
Split the Mary Johnson estimate by generation and it changes shape. Johnson’s share of the 2010 population was 1,932,812 out of 308,745,538, or 0.626%. Applied to each decade’s Marys, that gives an estimated 3,900 Mary Johnsons born in the 1950s (625,606 × 0.00626) and about 160 born in the 2010s (25,693 × 0.00626). A Mary Johnson born in 2015 has far fewer same-age namesakes than one born in 1955.
Today’s baby names say little about adults, too. SSA’s top names for 2025 were Liam and Olivia, and the Census Bureau found “little overlap” between the most popular names of babies born in 2020 and those of the whole population that year.
Names travel together. Surnames cluster by heritage. In the 2020 Census, 91% of people named Garcia identified as Hispanic, and Hispanic respondents were the group most concentrated in a few surnames: 14.2% had one of the group’s ten most common last names, against 4.4% of people who identified as White alone, the lowest of any group. If a first name is also more common in the same families, the simple multiplication undercounts that pair; if the two rarely meet, it overcounts. And because SSA counts only US births, first names that are more common among people born abroad are undercounted.
Spellings and the name you use. SSA counts each spelling separately, so Caitlin, Kaitlyn and Katelyn are different names in its data. Look up every spelling of your first and last name, and both your legal first name and the one you go by, then treat the results as a range.
Privacy protection. The 2020 Census counts pass through the bureau’s disclosure avoidance process, which protects respondents’ confidentiality and can push small counts below zero; the bureau publishes research versions of its files that keep those negative numbers. Treat small counts as approximate.
Different people, different years. A census count is a snapshot of the people counted on census day, while SSA’s century of births includes people who have since died. The mismatch shows: multiply Mary’s 2,845,637 births by Johnson’s 0.626% share instead, and the estimate becomes about 18,000 rather than 16,000. Both are defensible, and neither is a count.
What the estimate can and can’t tell you
It can tell you roughly how crowded your name is: whether it is shared by tens of thousands of people, by dozens, or possibly by nobody else. That is enough to know how carefully to check anything that carries your name.
It can’t tell you the exact number, how many of those people are alive today, how old they are, where they live, or whether a particular record, listing or search result is about you or about one of them.
How to look up your own names in the official data
Both agencies post their files online for download.
- Your last name. On the Census Bureau’s 2020 names page, open the complete last-name spreadsheet, or the top-1,000 file if your name is common, and find your surname’s count. Divide it by 331,449,281, the 2020 Census population, to get its share. If your surname isn’t listed, fewer than 100 people reported it in 2020; the 2010 file is a second check.
- Your first name. Find its count in the 2020 first-name spreadsheet, which is split by sex.
- Your full name, all ages. Multiply your first name’s count by your surname’s share.
- Your full name, your generation. In SSA’s Popular Names by Birth Year search, choose your birth year and “Number of births” to see how many babies got your first name, then multiply that by your surname’s share. The search shows only the top 1,000 names; for rarer ones, the national data file described on SSA’s page about its files lists names given to at least five babies in a year.
- Every spelling. Repeat the steps for each spelling and form of your name, and read the results as a range rounded to two significant figures.
When many people share your name
A shared name is how records get crossed. With an estimated 3,900 Mary Johnsons born in the 1950s alone, even a name plus an age range can describe thousands of people, and a record that lists only a name and a rough age is easy to attach to the wrong one.
Before you accept any record, listing or search result as yours, or as someone else’s, look for at least two independent details that agree:
- The age or birth year fits, allowing a few years when a record gives only a range.
- A city or county lines up with where you lived during the years the record covers.
- A middle name or initial matches, or at least doesn’t conflict.
- A suffix such as Jr. or Sr. fits, since a parent and child can share a full name.
- A relative, spouse or past address you recognize appears with it.
- The details come from different places, because two copies of one listing count once.
The full method is in how to check that a record belongs to the right person. To find someone else with a common name, see how to find someone by name and how to search for someone online.
The same rule applies when you look yourself up. In Recordwell’s free self-check, people who share your name appear as separate candidates, and one is treated as you only when two independent details agree, such as your age range and a city you lived in. A result about a namesake isn’t about you, and an empty section isn’t proof that nothing exists elsewhere.
When you look up someone else, a people search by name is a starting point, not a verdict. Confirm anything important in the original record at the office that keeps it, and keep in mind that some records are sealed or restricted for good reason. A name match should never decide someone’s job, housing, credit or insurance; that takes an FCRA-compliant screening service, and Recordwell is not a consumer reporting agency.
Common questions about how common your name is
How many people in the US have the same name as me?
Neither the Census Bureau nor Social Security publishes counts of full names, so you can only estimate it: multiply the number of people with your last name by the share of people with your first name. With 2010 Census and Social Security figures, James Smith comes to roughly 31,000 people, while a surname at the Census cutoff of 100 people gives at most about one.
Why does a name calculator say nobody else has my name?
One of your names may fall below a publishing cutoff, or the multiplication may come to less than one person. The Census lists include only names reported at least 100 times, and Social Security leaves out names given to fewer than five babies in a year. A zero means your name is rare or missing from the data, not that you are the only one.
What is the most common last name in the US?
Smith. The 2010 Census counted 2,442,977 people named Smith, and it was still first in the 2020 Census, followed by Johnson, Williams, Brown and Jones. Garcia ranked sixth and Rodriguez eighth in 2020.
What is the most common first name in the US?
Among people counted in the 2020 Census, Michael, followed by John, James, David and Robert. Among babies born from 1926 through 2025, Social Security’s leaders are James for boys and Mary for girls; for babies born in 2025 alone, Liam and Olivia.
How accurate are “how many of me” calculators?
Treat them as rough. They combine separate first-name and last-name counts, so they inherit the weaknesses of that method: first names that follow birth years, names that run in the same families, spelling variants, publishing cutoffs and data from different years. Use the result to judge whether your name is common or rare, not as a headcount.