2010
#133,048
National surname rank
Recorded bearers 127
First available Census row
Per 100,000 0.04
Very Rare Last name
Antonius
A Roman family name derived from the masculine given name Antonius.
According to the 2020 US Census Bureau surname tables, roughly 162 Americans carry the last name Antonius. That puts it at #127,013 in the national surname ranking, appearing at a frequency of 0.05 per 100,000 people (about 1 in 2,115,768 residents).
This page is the full Name Census profile for the Antonius 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
162
1 in 2,115,768
Census rank
#127,013
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
141
very rare in the US
Popularity narrative
The Census Bureau recorded 141 bearers of the surname Antonius in its 2020 decennial surname file. At a rate of 0.05 per 100,000 residents, it holds the 127013th position in the national surname ranking.
Among Census respondents with the surname Antonius, the largest self-reported group is White at 80.1%. The next largest groups are Asian/Pacific Islander (11.3%) and Hispanic (4.3%).
Origin
Meaning and origin of Antonius
The surname Antonius originated from the ancient Roman family name Antonius, which was derived from the praenomen (personal name) Antonius. The name is believed to have its roots in the Latin word "ante," meaning "before" or "in front of." This suggests that the name may have initially referred to the firstborn son or the one who came before others.
The Antonius family was one of the most prominent and influential families in ancient Rome. They were a branch of the gens Antonia, a patrician family that traced its lineage back to the founding of Rome. The Antonii were known for their military prowess and political influence, producing several notable figures throughout Roman history.
One of the earliest recorded instances of the name Antonius can be found in the writings of Roman historian Livy, who mentioned a Roman consul named Quintus Antonius Merenda in the 4th century BC. Another early reference is Marcus Antonius, a Roman general and politician who lived from 83 BC to 30 BC and was a key figure in the Roman civil wars following the assassination of Julius Caesar.
During the Middle Ages, the name Antonius continued to be used, particularly in Italy and other regions with strong Roman influences. In the 12th century, the Antonii family emerged as a prominent noble family in Padua, Italy, and their name was often recorded in official documents and historical chronicles of that period.
One notable bearer of the surname Antonius was Pietro Antonius (1448-1530), an Italian humanist scholar and diplomat who served as a secretary to several popes and played a significant role in the cultural and intellectual life of Renaissance Italy.
Another prominent figure was Girolamo Antonius (1492-1564), an Italian jurist and legal scholar who held the position of professor of civil law at the University of Padua and contributed significantly to the development of legal studies in the 16th century.
During the 16th and 17th centuries, the surname Antonius spread beyond Italy to other parts of Europe, particularly in regions with strong Catholic influence, such as Spain and France. One notable bearer of the name was François Antonius (1586-1644), a French mathematician and astronomer who made significant contributions to the study of celestial mechanics.
In the 18th century, the name Antonius appeared in various spellings, such as Antonie, Antoine, and Antony, reflecting regional linguistic variations. One prominent figure from this period was Johann Antonie (1726-1798), a German philosopher and theologian who wrote extensively on moral philosophy and the nature of human freedom.
By the 19th century, the surname Antonius had become more widely dispersed across Europe and even beyond, with various families bearing the name in countries like the Netherlands, Belgium, and the United States.
Demographics
Ancestry and ethnicity for Antonius
Among Census respondents with the surname Antonius, the largest self-reported group is White at 80.1%. The next largest groups are Asian/Pacific Islander (11.3%) and Hispanic (4.3%).
The bar chart below shows how Antonius 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 Antonius surname at the time of the 2020 Census, not any inherent property of the name itself.
- White80.1% · 113
- Asian and Pacific Islander11.3% · 16
- Hispanic or Latino4.3% · 6
- Black or African American2.1% · 3
- Two or more races2.1% · 3
Timeline
Historical Census data for Antonius
Antonius 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
#127,013
National surname rank
Recorded bearers 141
+14 bearers (+11.0%)
Per 100,000 0.05
Rank movement Up 6,035 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #133,048 | 127 | 0.04 | First available Census row | First available Census row |
| 2020 | #127,013 | 141 | 0.05 | +14 bearers (+11.0%) | Up 6,035 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 Antonius 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 | #133,048 | #127,013 | 4.5% |
| Count | 127 | 141 | 11.0% |
| Per 100K | 0.04 | 0.05 | 17.9% |
Between the 2010 and 2020 Census, the number of Antonius bearers went from 127 to 141 (+11.0% change). The surname moved up 6,035 positions in the national ranking, going from #133,048 to #127,013.
FAQ
Antonius surname: questions and answers
How many people in the U.S. have the surname Antonius?
Name Census estimates that about 162 living Americans carry the surname Antonius. Using the current population baseline, that works out to roughly 1 in 2,115,768 residents.
How common is Antonius?
Antonius ranks #127,013 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.05 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 141 people with the surname Antonius. That is different from the site's living-bearer estimate (162), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.05 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.05 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 Antonius.
Has Antonius become more or less common over time?
Between 2010 and 2020, the surname Antonius went from 127 recorded bearers to 141. That is an increase of 14 (+11.0%). In the national ranking it rose from #133,048 to #127,013.
What does the Census say about the background of Antonius?
Among Census respondents with the surname Antonius, the largest self-reported group is White at 80.1%. The next largest groups are Asian/Pacific Islander (11.3%) and Hispanic (4.3%). 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?
White is the largest self-reported group for the surname Antonius in the 2020 Census, accounting for 80.1% (113 people in the source table).
What is the full ancestry breakdown?
Antonius appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (80.1%), Asian/Pacific Islander (11.3%), Hispanic (4.3%). 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 Antonius (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 Antonius mean?
A Roman family name derived from the masculine given name Antonius. 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 Antonius (0.05 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 Antonius?
Our sister site HowManyOfMe.org answers how common the surname Antonius is at a glance, with the living-bearer count up front.