2000
#78,549
National surname rank
Recorded bearers 226
First available Census row
Per 100,000 0.08
Very Rare Last name
Isiordia
An Iberian surname derived from the Basque words "isi" (silent) and "ordi" (bread), potentially referring to a breadmaker.
According to the 2020 US Census Bureau surname tables, roughly 318 Americans carry the last name Isiordia. That puts it at #75,111 in the national surname ranking, appearing at a frequency of 0.09 per 100,000 people (about 1 in 1,077,844 residents).
This page is the full Name Census profile for the Isiordia 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
318
1 in 1,077,844
Census rank
#75,111
2020 decennial data
Per 100,000
0.1
Frequency rate
Recorded bearers
277
very rare in the US
Popularity narrative
The Census Bureau recorded 277 bearers of the surname Isiordia in its 2020 decennial surname file. At a rate of 0.09 per 100,000 residents, it holds the 75111th position in the national surname ranking.
Among Census respondents with the surname Isiordia, the largest self-reported group is Hispanic at 97.1%. The next largest groups are White (2.5%) and American Indian/Alaska Native (0.4%).
Origin
Meaning and origin of Isiordia
The surname Isiordia has its origins in the Basque region of northern Spain and southwestern France. It is believed to have emerged in the early medieval period, around the 8th or 9th century AD. The name is derived from the Basque words "isi" meaning "silent" or "quiet," and "ordia" meaning "oak grove" or "oak forest."
One of the earliest recorded instances of the Isiordia name can be found in a document from the Monastery of San Millán de la Cogolla in La Rioja, Spain, dated to the year 1022. This document mentions a landowner named García Isiordia, suggesting the name's use in the region during that time.
In the 13th century, there are records of an Isiordia family residing in the town of Vitoria-Gasteiz, the capital of the Basque Country. This family held significant influence and wealth, with members serving as local officials and landowners.
During the 15th century, the Isiordia name gained prominence with the birth of Pedro Isiordia (1435-1504), a renowned scholar and theologian from Navarre. Pedro Isiordia studied at the University of Paris and later became a professor at the University of Salamanca, where he taught philosophy and theology.
Another notable figure with the Isiordia surname was Juan Isiordia (1570-1633), a Spanish military officer and explorer. Juan Isiordia served as a captain in the Spanish army and participated in various expeditions to the Americas, contributing to the exploration and colonization efforts of the Spanish Empire.
In the 17th century, the Isiordia name appeared in records related to the town of Oñati, located in the Basque province of Gipuzkoa. Several members of the Isiordia family held influential positions in the local government and were involved in the region's wool trade.
During the 18th century, María Isiordia (1712-1782), a renowned writer and poet, gained recognition for her works celebrating Basque culture and traditions. Her poetry collection, "Cantos del Norte" (Songs of the North), became a significant contribution to the preservation of Basque literature.
Throughout history, variations of the Isiordia name have been documented, such as Isiordía, Isiordi, and Isiorde. These variations likely emerged due to regional dialects and spelling preferences in different areas where the name was present.
Demographics
Ancestry and ethnicity for Isiordia
Among Census respondents with the surname Isiordia, the largest self-reported group is Hispanic at 97.1%. The next largest groups are White (2.5%) and American Indian/Alaska Native (0.4%).
The bar chart below shows how Isiordia 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 Isiordia surname at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino97.1% · 269
- White2.5% · 7
- American Indian and Alaska Native0.4% · 1
Timeline
Historical Census data for Isiordia
Isiordia 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
#59,017
National surname rank
Recorded bearers 343
+117 bearers (+51.8%)
Per 100,000 0.12
Rank movement Up 19,532 places
2020
#75,111
National surname rank
Recorded bearers 277
-66 bearers (-19.2%)
Per 100,000 0.09
Rank movement Down 16,094 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #78,549 | 226 | 0.08 | First available Census row | First available Census row |
| 2010 | #59,017 | 343 | 0.12 | +117 bearers (+51.8%) | Up 19,532 places |
| 2020 | #75,111 | 277 | 0.09 | -66 bearers (-19.2%) | Down 16,094 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 Isiordia 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 | #59,017 | #75,111 | -27.3% |
| Count | 343 | 277 | -19.2% |
| Per 100K | 0.12 | 0.09 | -22.8% |
Between the 2010 and 2020 Census, the number of Isiordia bearers went from 343 to 277 (-19.2% change). The surname moved down 16,094 positions in the national ranking, going from #59,017 to #75,111.
FAQ
Isiordia surname: questions and answers
How many people in the U.S. have the surname Isiordia?
Name Census estimates that about 318 living Americans carry the surname Isiordia. Using the current population baseline, that works out to roughly 1 in 1,077,844 residents.
How common is Isiordia?
Isiordia ranks #75,111 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.09 per 100,000 residents, which is about 0 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 277 people with the surname Isiordia. That is different from the site's living-bearer estimate (318), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.09 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.09 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 0 of them to have the surname Isiordia.
Has Isiordia become more or less common over time?
Between 2010 and 2020, the surname Isiordia went from 343 recorded bearers to 277. That is a decrease of 66 (-19.2%). In the national ranking it fell from #59,017 to #75,111.
What does the Census say about the background of Isiordia?
Among Census respondents with the surname Isiordia, the largest self-reported group is Hispanic at 97.1%. The next largest groups are White (2.5%) and American Indian/Alaska Native (0.4%). 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 Isiordia in the 2020 Census, accounting for 97.1% (269 people in the source table).
What is the full ancestry breakdown?
Isiordia appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Hispanic (97.1%), White (2.5%), American Indian/Alaska Native (0.4%). 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 Isiordia (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 Isiordia mean?
An Iberian surname derived from the Basque words "isi" (silent) and "ordi" (bread), potentially referring to a breadmaker. 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 Isiordia (0.09 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 Americans have the surname Isiordia?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.