2010
#143,149
National surname rank
Recorded bearers 116
First available Census row
Per 100,000 0.04
Very Rare Last name
Iosia
A surname derived from the Italian male given name Iosio, itself a variant of Iosè (Joseph).
According to the 2020 US Census Bureau surname tables, roughly 138 Americans carry the last name Iosia. That puts it at #142,049 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,483,727 residents).
This page is the full Name Census profile for the Iosia 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
138
1 in 2,483,727
Census rank
#142,049
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
120
very rare in the US
Popularity narrative
The Census Bureau recorded 120 bearers of the surname Iosia in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 142049th position in the national surname ranking.
Among Census respondents with the surname Iosia, the largest self-reported group is Asian/Pacific Islander at 89.2%. The next largest groups are Two or More Races (4.2%) and Hispanic (2.5%).
Origin
Meaning and origin of Iosia
The surname IOSIA has its origins in medieval Italy, traced back to the late 12th century. It is believed to have emerged from the Latin word "Iosua," which was a variant spelling of the biblical name Joshua. The name IOSIA was predominantly found in the regions of Tuscany and Umbria during this period.
One of the earliest recorded instances of the surname IOSIA can be found in a 13th-century manuscript from the Archivio di Stato di Firenze, which mentions a certain "Giovanni di IOSIA" as a landowner in the Chianti region. This document provides evidence of the name's existence in Tuscany during the Middle Ages.
In the 14th century, the IOSIA family rose to prominence in the city of Perugia, located in the region of Umbria. Records from the Archivio di Stato di Perugia mention several notable individuals bearing this surname, including Galeazzo IOSIA (1325-1390), a prominent merchant and banker, and Benedetto IOSIA (1370-1428), a respected lawyer and jurist.
The IOSIA surname is also linked to several place names in Italy. For instance, the village of Iosia, situated in the province of Reggio Calabria, is believed to have derived its name from the IOSIA family, who may have held lands or influence in that area during the medieval period.
Throughout history, several notable figures have carried the IOSIA surname. One such individual was Girolamo IOSIA (1492-1556), a Renaissance humanist and philosopher from Perugia, who was renowned for his works on ethics and political theory. Another prominent IOSIA was Ottavio IOSIA (1585-1647), a Baroque-era architect and engineer from Florence, who contributed to the design of several notable buildings and fortifications in Tuscany.
In the 19th century, the IOSIA surname gained further recognition with the birth of Antonio IOSIA (1818-1892), a celebrated Italian painter and sculptor from Naples. His works, which often depicted scenes from classical mythology and Italian folklore, were highly acclaimed during his lifetime and can be found in various art galleries and museums across Italy.
It is worth noting that while the surname IOSIA has ancient roots and a rich history, it has remained relatively uncommon throughout the centuries, particularly outside of Italy. Nevertheless, the name continues to be a part of the rich tapestry of Italian heritage and serves as a reminder of the country's diverse cultural and linguistic traditions.
Demographics
Ancestry and ethnicity for Iosia
Among Census respondents with the surname Iosia, the largest self-reported group is Asian/Pacific Islander at 89.2%. The next largest groups are Two or More Races (4.2%) and Hispanic (2.5%).
The bar chart below shows how Iosia 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 Iosia surname at the time of the 2020 Census, not any inherent property of the name itself.
- Asian and Pacific Islander89.2% · 107
- Two or more races4.2% · 5
- Hispanic or Latino2.5% · 3
- White1.7% · 2
- American Indian and Alaska Native1.7% · 2
- Black or African American0.8% · 1
Timeline
Historical Census data for Iosia
Iosia appears in 2 published Census surname files: 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2020
#142,049
National surname rank
Recorded bearers 120
+4 bearers (+3.4%)
Per 100,000 0.04
Rank movement Up 1,100 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #143,149 | 116 | 0.04 | First available Census row | First available Census row |
| 2020 | #142,049 | 120 | 0.04 | +4 bearers (+3.4%) | Up 1,100 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 Iosia 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 | #143,149 | #142,049 | 0.8% |
| Count | 116 | 120 | 3.4% |
| Per 100K | 0.04 | 0.04 | 0.4% |
Between the 2010 and 2020 Census, the number of Iosia bearers went from 116 to 120 (+3.4% change). The surname moved up 1,100 positions in the national ranking, going from #143,149 to #142,049.
FAQ
Iosia surname: questions and answers
How many people in the U.S. have the surname Iosia?
Name Census estimates that about 138 living Americans carry the surname Iosia. Using the current population baseline, that works out to roughly 1 in 2,483,727 residents.
How common is Iosia?
Iosia ranks #142,049 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.04 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 120 people with the surname Iosia. That is different from the site's living-bearer estimate (138), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.04 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.04 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 Iosia.
Has Iosia become more or less common over time?
Between 2010 and 2020, the surname Iosia went from 116 recorded bearers to 120. That is an increase of 4 (+3.4%). In the national ranking it rose from #143,149 to #142,049.
What does the Census say about the background of Iosia?
Among Census respondents with the surname Iosia, the largest self-reported group is Asian/Pacific Islander at 89.2%. The next largest groups are Two or More Races (4.2%) and Hispanic (2.5%). 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?
Asian/Pacific Islander is the largest self-reported group for the surname Iosia in the 2020 Census, accounting for 89.2% (107 people in the source table).
What is the full ancestry breakdown?
Iosia appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Asian/Pacific Islander (89.2%), Two or More Races (4.2%), Hispanic (2.5%). 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 Iosia (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 Iosia mean?
A surname derived from the Italian male given name Iosio, itself a variant of Iosè (Joseph). 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 Iosia (0.04 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 have the last name Iosia?
You can see how many Americans have the surname Iosia on our sister site HowManyOfMe.org — same data roots, lighter UI.