2000
#13,943
National surname rank
Recorded bearers 1,985
First available Census row
Per 100,000 0.74
Rare Last name
Fierros
A Spanish surname referring to someone who worked with or sold iron.
According to the 2020 US Census Bureau surname tables, roughly 3,115 Americans carry the last name Fierros. That puts it at #11,150 in the national surname ranking, appearing at a frequency of 0.91 per 100,000 people (about 1 in 110,033 residents).
This page is the full Name Census profile for the Fierros surname. You will find the Census Bureau frequency data, a multi-census history view, an ancestry and ethnicity breakdown based on self-reported demographics, the name's meaning and origin where available, and answers to the most common questions people ask about this surname.
Bearers in the US
3.1K
1 in 110,033
Census rank
#11,150
2020 decennial data
Per 100,000
0.9
Frequency rate
Recorded bearers
2.7K
rare in the US
Popularity narrative
The Census Bureau recorded 2,716 bearers of the surname Fierros in its 2020 decennial surname file. At a rate of 0.91 per 100,000 residents, it holds the 11150th position in the national surname ranking.
Among Census respondents with the surname Fierros, the largest self-reported group is Hispanic at 93.9%. The next largest groups are White (5.4%) and Asian/Pacific Islander (0.3%).
Origin
Meaning and origin of Fierros
The surname Fierros has its origins in Spain and dates back to the 16th century. It is derived from the Spanish word "fierro," meaning iron or ironworker. This suggests that the name was originally an occupational surname given to those who worked with iron, such as blacksmiths or ironmongers.
The earliest recorded use of the name Fierros can be found in the parish records of Seville, Spain, in the year 1587. The name was also present in the historic city of Málaga, where it is believed to have originated from the Andalusian region of southern Spain.
One of the earliest known individuals bearing the surname Fierros was Juan Fierros, a blacksmith from the town of Antequera, near Málaga, who lived in the late 16th century. Another notable figure was Pedro Fierros, a soldier who participated in the Spanish conquest of the Americas in the early 17th century.
In the 18th century, the Fierros name appeared in various colonial records from Spanish settlements in the Americas, particularly in Mexico and parts of South America. For example, Juana Fierros was a landowner in the region of New Spain (present-day Mexico) in the 1750s.
During the 19th century, the Fierros surname gained prominence in various parts of Latin America, including Chile and Argentina. One notable individual was Manuel Fierros, a Chilean politician and lawyer who lived from 1825 to 1892 and served as a member of the Chilean Congress.
Another notable bearer of the Fierros name was Mariano Fierros, an Argentine military officer who fought in the War of Independence against Spain in the early 19th century. He was born in 1790 and played a significant role in the battles for Argentine independence.
As the Fierros name spread across Spanish-speaking regions, it also appeared in various place names and geographical locations. For instance, there is a town called Fierros in the Mexican state of Coahuila, and a rural area named Campo Fierros in the Argentine province of Córdoba.
Demographics
Ancestry and ethnicity for Fierros
Among Census respondents with the surname Fierros, the largest self-reported group is Hispanic at 93.9%. The next largest groups are White (5.4%) and Asian/Pacific Islander (0.3%).
The bar chart below shows how Fierros bearers described their own race and ethnicity on the 2020 Census form. The Census Bureau groups responses into six broad categories: White, Black or African American, Hispanic or Latino, Asian and Pacific Islander, American Indian and Alaska Native, and Two or More Races. When a category has too few respondents for a given surname, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown for every Census year so the breakdown stays comparable over time. When the source file also includes raw headcounts, Name Census shows those alongside the percentages in the legend.
Keep in mind that these are self-reported numbers. A person's surname does not determine their race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the Fierros surname at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino93.9% · 2,549
- White5.4% · 148
- Asian and Pacific Islander0.3% · 8
- Black or African American0.1% · 4
- Two or more races0.1% · 4
- American Indian and Alaska Native0.1% · 3
Timeline
Historical Census data for Fierros
Fierros appears in 3 published Census surname files: 2000, 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2010
#11,448
National surname rank
Recorded bearers 2,751
+766 bearers (+38.6%)
Per 100,000 0.93
Rank movement Up 2,495 places
2020
#11,150
National surname rank
Recorded bearers 2,716
-35 bearers (-1.3%)
Per 100,000 0.91
Rank movement Up 298 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #13,943 | 1,985 | 0.74 | First available Census row | First available Census row |
| 2010 | #11,448 | 2,751 | 0.93 | +766 bearers (+38.6%) | Up 2,495 places |
| 2020 | #11,150 | 2,716 | 0.91 | -35 bearers (-1.3%) | Up 298 places |
For 2020, the Census Bureau published race and Hispanic-origin columns as counts rather than percentages. Name Census converts those counts back into shares so the ancestry section stays comparable with the older surname files.
Year on year
2010 vs 2020 Census
How has the Fierros surname changed between Census years? The chart shows bearer count side by side, and the table compares rank, count, and frequency.
Census year comparison
20102020
| Metric | 2010 | 2020 | Change |
|---|---|---|---|
| Rank | #11,448 | #11,150 | 2.6% |
| Count | 2,751 | 2,716 | -1.3% |
| Per 100K | 0.93 | 0.91 | -2.3% |
Between the 2010 and 2020 Census, the number of Fierros bearers went from 2,751 to 2,716 (-1.3% change). The surname moved up 298 positions in the national ranking, going from #11,448 to #11,150.
FAQ
Fierros surname: questions and answers
How many people in the U.S. have the surname Fierros?
Name Census estimates that about 3,115 living Americans carry the surname Fierros. Using the current population baseline, that works out to roughly 1 in 110,033 residents.
How common is Fierros?
Fierros ranks #11,150 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 0.91 per 100,000 residents, which is about 1 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 2,716 people with the surname Fierros. That is different from the site's living-bearer estimate (3,115), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.91 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.91 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 1 of them to have the surname Fierros.
Has Fierros become more or less common over time?
Between 2010 and 2020, the surname Fierros went from 2,751 recorded bearers to 2,716. That is a decrease of 35 (-1.3%). In the national ranking it rose from #11,448 to #11,150.
What does the Census say about the background of Fierros?
Among Census respondents with the surname Fierros, the largest self-reported group is Hispanic at 93.9%. The next largest groups are White (5.4%) and Asian/Pacific Islander (0.3%). These figures come from the 2020 Census Bureau surname tables, based on how respondents described their own race and ethnicity.
Which group reports this surname most often?
Hispanic is the largest self-reported group for the surname Fierros in the 2020 Census, accounting for 93.9% (2,549 people in the source table).
What is the full ancestry breakdown?
Fierros appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Hispanic (93.9%), White (5.4%), Asian/Pacific Islander (0.3%). For 2020, the source file also published raw headcounts for each group, which is why this page can show both percentages and counts in the ancestry section.
Is this page using the latest Census data?
Yes. This page is using the latest surname file currently loaded on Name Census, which is 2020. The historical section above also keeps any older Census surname entries we have for Fierros (2000, 2010, 2020).
Does the Census include every surname?
No. The Census Bureau only publishes surnames that appeared at least 100 times in a given decennial Census. That means very rare surnames are excluded entirely, and a surname can appear in one Census release but disappear from a later one if it falls below the reporting threshold.
Why don't the ancestry percentages always add up to exactly 100%?
There are two main reasons: rounding and suppression. The Census Bureau rounds published values, and it may suppress very small cells to protect privacy. For 2020, the Bureau also published raw group counts rather than direct percentages, so Name Census converts those counts back into shares for comparability across census years.
What does Fierros mean?
A Spanish surname referring to someone who worked with or sold iron. The fuller origin note on this page goes into more detail.
Where does the surname data come from?
All surname statistics on Name Census are drawn from the US Census Bureau's decennial surname frequency tables. These files list every surname that appeared 100 or more times in the 2020 Census, along with a count, a per-100,000 rate, and a self-reported demographic breakdown. You can read the full explanation on our methodology page.
How does Name Census estimate living bearers?
For surnames, Name Census does not age cohorts the way it does for first names. Instead, it takes the Census Bureau's published frequency for Fierros (0.91 per 100,000) and applies that rate to the current U.S. resident population to estimate how many living Americans have the surname today.
How many people share the surname Fierros?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.