2000
#20,367
National surname rank
Recorded bearers 1,213
First available Census row
Per 100,000 0.45
Rare Last name
Isidro
Derived from the Greek name Isidoros, meaning "gift of Isis," the Egyptian goddess of fertility and magic.
According to the 2020 US Census Bureau surname tables, roughly 2,441 Americans carry the last name Isidro. That puts it at #13,624 in the national surname ranking, appearing at a frequency of 0.71 per 100,000 people (about 1 in 140,416 residents).
This page is the full Name Census profile for the Isidro 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
2.4K
1 in 140,416
Census rank
#13,624
2020 decennial data
Per 100,000
0.7
Frequency rate
Recorded bearers
2.1K
rare in the US
Popularity narrative
The Census Bureau recorded 2,129 bearers of the surname Isidro in its 2020 decennial surname file. At a rate of 0.71 per 100,000 residents, it holds the 13624th position in the national surname ranking.
Among Census respondents with the surname Isidro, the largest self-reported group is Hispanic at 64.9%. The next largest groups are Asian/Pacific Islander (29.1%) and White (3.3%).
Origin
Meaning and origin of Isidro
The surname Isidro has its origins in Spain, where it first emerged in the medieval period. It is derived from the Spanish form of the Latin name Isidorus, which itself comes from the Greek words "isos" meaning "equal" and "doron" meaning "gift". This suggests the name may have originally referred to someone who was perceived as being of equal standing or possessing equal gifts.
Isidro is a patronymic surname, meaning it was originally formed by adding a prefix or suffix to the given name of an ancestor. In this case, the Spanish suffix "-o" was added to the name Isidoro to create the surname Isidro. This practice of deriving surnames from given names was common across medieval Europe.
One of the earliest recorded instances of the surname Isidro can be found in the Becerro de Behetrías, a 14th century census-like record of landowners and vassals in Castile. An entry from 1352 mentions one "Ferran Isidro" from the town of Villarmentero. Place names like this often provided the basis for surnames in that era.
The surname also has ties to Saint Isidore of Seville (c.560-636), a scholar and cleric who served as Archbishop of Seville and is regarded as the last of the Fathers of the Church. His influential writings and teachings likely popularized the name Isidoro/Isidro in Spain during his lifetime and the centuries after.
Other notable individuals with the surname Isidro include Juan del Isidro (1515-1594), a Spanish composer of sacred music during the Renaissance, and José Isidro Fabela Alfaro (1882-1964), a Mexican diplomat who represented his country at the League of Nations in the 1920s. Painter Francisco Isidro de Gárate (1804-1869) was a pioneer of Venezuelan romantic art in the 19th century.
Demographics
Ancestry and ethnicity for Isidro
Among Census respondents with the surname Isidro, the largest self-reported group is Hispanic at 64.9%. The next largest groups are Asian/Pacific Islander (29.1%) and White (3.3%).
The bar chart below shows how Isidro 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 Isidro surname at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino64.9% · 1,381
- Asian and Pacific Islander29.1% · 619
- White3.3% · 71
- Two or more races2.4% · 51
- American Indian and Alaska Native0.2% · 4
- Black or African American0.1% · 3
Timeline
Historical Census data for Isidro
Isidro 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
#14,127
National surname rank
Recorded bearers 2,127
+914 bearers (+75.4%)
Per 100,000 0.72
Rank movement Up 6,240 places
2020
#13,624
National surname rank
Recorded bearers 2,129
+2 bearers (+0.1%)
Per 100,000 0.71
Rank movement Up 503 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #20,367 | 1,213 | 0.45 | First available Census row | First available Census row |
| 2010 | #14,127 | 2,127 | 0.72 | +914 bearers (+75.4%) | Up 6,240 places |
| 2020 | #13,624 | 2,129 | 0.71 | +2 bearers (+0.1%) | Up 503 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 Isidro 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 | #14,127 | #13,624 | 3.6% |
| Count | 2,127 | 2,129 | 0.1% |
| Per 100K | 0.72 | 0.71 | -1.1% |
Between the 2010 and 2020 Census, the number of Isidro bearers went from 2,127 to 2,129 (+0.1% change). The surname moved up 503 positions in the national ranking, going from #14,127 to #13,624.
FAQ
Isidro surname: questions and answers
How many people in the U.S. have the surname Isidro?
Name Census estimates that about 2,441 living Americans carry the surname Isidro. Using the current population baseline, that works out to roughly 1 in 140,416 residents.
How common is Isidro?
Isidro ranks #13,624 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 0.71 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 2,129 people with the surname Isidro. That is different from the site's living-bearer estimate (2,441), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.71 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.71 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 Isidro.
Has Isidro become more or less common over time?
Between 2010 and 2020, the surname Isidro went from 2,127 recorded bearers to 2,129. That is an increase of 2 (+0.1%). In the national ranking it rose from #14,127 to #13,624.
What does the Census say about the background of Isidro?
Among Census respondents with the surname Isidro, the largest self-reported group is Hispanic at 64.9%. The next largest groups are Asian/Pacific Islander (29.1%) and White (3.3%). 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 Isidro in the 2020 Census, accounting for 64.9% (1,381 people in the source table).
What is the full ancestry breakdown?
Isidro appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Hispanic (64.9%), Asian/Pacific Islander (29.1%), White (3.3%). 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 Isidro (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 Isidro mean?
Derived from the Greek name Isidoros, meaning "gift of Isis," the Egyptian goddess of fertility and magic. 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 Isidro (0.71 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 Isidro?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.