2000
#5,670
National surname rank
Recorded bearers 5,615
First available Census row
Per 100,000 2.08
Rare Last name
Bias
A French topographic surname for someone who lived by a ford or shallow crossing of a river or stream.
According to the 2020 US Census Bureau surname tables, roughly 6,326 Americans carry the last name Bias. That puts it at #6,005 in the national surname ranking, appearing at a frequency of 1.85 per 100,000 people (about 1 in 54,182 residents).
This page is the full Name Census profile for the Bias 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.
For British records, Name Census UK has a British surname profile for Bias with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
6.3K
1 in 54,182
Census rank
#6,005
2020 decennial data
Per 100,000
1.8
Frequency rate
Recorded bearers
5.5K
rare in the US
Popularity narrative
The Census Bureau recorded 5,517 bearers of the surname Bias in its 2020 decennial surname file. At a rate of 1.85 per 100,000 residents, it holds the 6005th position in the national surname ranking.
Among Census respondents with the surname Bias, the largest self-reported group is White at 53.4%. The next largest groups are Black (32.6%) and Hispanic (6.7%).
Origin
Meaning and origin of Bias
The surname BIAS finds its origins in Spain, where it emerged in the medieval era. It is believed to be derived from the Spanish word "bias," which means "oblique" or "slanted." This name likely referred to someone who lived or worked on a sloping or slanted piece of land, or perhaps someone with a physical characteristic that was considered oblique or slanted.
One of the earliest recorded instances of the BIAS surname can be found in the Catalan region of Spain, where a reference to a "Guillem Bias" appears in a document dated 1275. This suggests that the name was already established in the area by the late 13th century.
In the 14th century, the BIAS surname appears to have spread to other parts of Spain, as evidenced by records from the city of Seville. A document from 1382 mentions a "Pedro Bias" who was a landowner in the region.
As the BIAS family grew and dispersed throughout Spain, variations in spelling emerged, including "Biaz," "Byas," and "Bias." These variations likely stemmed from regional dialects and the inconsistencies in record-keeping during that time.
One notable figure in the BIAS lineage was Juan Bias, a Spanish explorer and navigator born in 1520 in Seville. Juan Bias accompanied several expeditions to the New World and is credited with mapping some of the coastal regions of present-day Colombia and Venezuela.
Another prominent individual with the BIAS surname was Francisca Bias (1592-1673), a Spanish nun and mystic who founded the Order of the Immaculate Conception in Granada. She gained renown for her religious writings and was later beatified by the Catholic Church.
In the 17th century, the BIAS surname made its way to the Americas, carried by Spanish colonists and settlers. One notable example is Juan Antonio Bias (1635-1712), a Spanish soldier and landowner who established a hacienda in what is now Mexico.
As the BIAS surname spread across the globe, it also found its way to other parts of Europe, including France, where it was recorded as "Biais" in some regions. Jean-Baptiste Biais (1758-1823) was a French painter and engraver who became known for his portraits and historical scenes.
In the 19th century, the BIAS surname appears in records from various parts of the world, reflecting the widespread migration and diaspora of Spanish families. One example is José Bias (1818-1892), a Cuban poet and journalist who was part of the literary movement known as "El Siboney."
Demographics
Ancestry and ethnicity for Bias
Among Census respondents with the surname Bias, the largest self-reported group is White at 53.4%. The next largest groups are Black (32.6%) and Hispanic (6.7%).
The bar chart below shows how Bias 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 Bias surname at the time of the 2020 Census, not any inherent property of the name itself.
- White53.4% · 2,945
- Black or African American32.6% · 1,798
- Hispanic or Latino6.7% · 367
- Two or more races5.4% · 296
- American Indian and Alaska Native1.1% · 61
- Asian and Pacific Islander0.9% · 50
Timeline
Historical Census data for Bias
Bias 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
#5,339
National surname rank
Recorded bearers 6,518
+903 bearers (+16.1%)
Per 100,000 2.21
Rank movement Up 331 places
2020
#6,005
National surname rank
Recorded bearers 5,517
-1,001 bearers (-15.4%)
Per 100,000 1.85
Rank movement Down 666 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #5,670 | 5,615 | 2.08 | First available Census row | First available Census row |
| 2010 | #5,339 | 6,518 | 2.21 | +903 bearers (+16.1%) | Up 331 places |
| 2020 | #6,005 | 5,517 | 1.85 | -1,001 bearers (-15.4%) | Down 666 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 Bias 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 | #5,339 | #6,005 | -12.5% |
| Count | 6,518 | 5,517 | -15.4% |
| Per 100K | 2.21 | 1.85 | -16.5% |
Between the 2010 and 2020 Census, the number of Bias bearers went from 6,518 to 5,517 (-15.4% change). The surname moved down 666 positions in the national ranking, going from #5,339 to #6,005.
FAQ
Bias surname: questions and answers
How many people in the U.S. have the surname Bias?
Name Census estimates that about 6,326 living Americans carry the surname Bias. Using the current population baseline, that works out to roughly 1 in 54,182 residents.
How common is Bias?
Bias ranks #6,005 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 1.85 per 100,000 residents, which is about 2 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 5,517 people with the surname Bias. That is different from the site's living-bearer estimate (6,326), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 1.85 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 1.85 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 2 of them to have the surname Bias.
Has Bias become more or less common over time?
Between 2010 and 2020, the surname Bias went from 6,518 recorded bearers to 5,517. That is a decrease of 1,001 (-15.4%). In the national ranking it fell from #5,339 to #6,005.
What does the Census say about the background of Bias?
Among Census respondents with the surname Bias, the largest self-reported group is White at 53.4%. The next largest groups are Black (32.6%) and Hispanic (6.7%). 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?
White is the largest self-reported group for the surname Bias in the 2020 Census, accounting for 53.4% (2,945 people in the source table).
What is the full ancestry breakdown?
Bias appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (53.4%), Black (32.6%), Hispanic (6.7%). 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 Bias (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 Bias mean?
A French topographic surname for someone who lived by a ford or shallow crossing of a river or stream. 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 Bias (1.85 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 common is the surname Bias?
For a quick modern take, check how common the surname Bias is on our sister site HowManyOfMe.org.