2000
#10,129
National surname rank
Recorded bearers 2,927
First available Census row
Per 100,000 1.09
Rare Last name
Mannion
An Irish surname derived from the Gaelic "Ó Mainnín," meaning "descendant of Mainnín," a personal name meaning "little monk."
According to the 2020 US Census Bureau surname tables, roughly 3,421 Americans carry the last name Mannion. That puts it at #10,278 in the national surname ranking, appearing at a frequency of 1.00 per 100,000 people (about 1 in 100,191 residents).
This page is the full Name Census profile for the Mannion 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 Mannion with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
3.4K
1 in 100,191
Census rank
#10,278
2020 decennial data
Per 100,000
1.0
Frequency rate
Recorded bearers
3.0K
rare in the US
Popularity narrative
The Census Bureau recorded 2,983 bearers of the surname Mannion in its 2020 decennial surname file. At a rate of 1.00 per 100,000 residents, it holds the 10278th position in the national surname ranking.
Among Census respondents with the surname Mannion, the largest self-reported group is White at 92.0%. The next largest groups are Hispanic (3.6%) and Two or More Races (2.5%).
Origin
Meaning and origin of Mannion
The surname Mannion has its origins in Ireland, where it emerged in the 11th century. It is derived from the Gaelic personal name "Mánaván," which means "little monk" or "monkling." The name was initially spelled in various ways, such as Mannavyn, Manawane, and Mannan.
The earliest recorded instance of the name Mannion can be found in the Annals of the Four Masters, a medieval Irish chronicle that covers events from the 12th to the 17th century. The annals mention a person named Mánaván Ó Mainnín, who lived in the 12th century and was a member of the Uí Mainnín clan from County Fermanagh.
In the 14th century, the surname Mannion appeared in the Pipe Rolls of County Fermanagh, an administrative record of the English Crown's finances in Ireland. These rolls listed several individuals with the name Mannion, including John Mannyun and William Mannyn.
One notable historical figure with the surname Mannion was Terence Mannion (1767-1834), an Irish Catholic priest and educator from County Fermanagh. He played a significant role in establishing schools for Catholic children in Ireland during a time when Catholic education was severely restricted.
Another prominent individual was Patrick Mannion (1821-1899), an Irish-born Catholic priest who served as the Bishop of Leadville, Colorado, in the United States. He was known for his efforts in building churches and schools for Irish immigrant communities in the American West.
In the literary world, Niall Mannion (1925-2013) was an Irish poet and broadcaster who published several collections of poetry and served as the director of the Irish Museum of Modern Art for many years.
Bridget Mannion (1859-1930) was a notable Irish politician and activist who campaigned for women's suffrage and served as a member of the Dublin Corporation, one of the first women to hold such a position in Ireland.
The surname Mannion has also been associated with various place names in Ireland, such as Ballymannion and Mannion's Bridge, which were derived from the name's geographical distribution and the presence of Mannion families in those areas.
Demographics
Ancestry and ethnicity for Mannion
Among Census respondents with the surname Mannion, the largest self-reported group is White at 92.0%. The next largest groups are Hispanic (3.6%) and Two or More Races (2.5%).
The bar chart below shows how Mannion 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 Mannion surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.0% · 2,744
- Hispanic or Latino3.6% · 108
- Two or more races2.5% · 74
- Asian and Pacific Islander0.9% · 26
- Black or African American0.7% · 22
- American Indian and Alaska Native0.3% · 9
Timeline
Historical Census data for Mannion
Mannion 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
#10,358
National surname rank
Recorded bearers 3,111
+184 bearers (+6.3%)
Per 100,000 1.05
Rank movement Down 229 places
2020
#10,278
National surname rank
Recorded bearers 2,983
-128 bearers (-4.1%)
Per 100,000 1.00
Rank movement Up 80 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #10,129 | 2,927 | 1.09 | First available Census row | First available Census row |
| 2010 | #10,358 | 3,111 | 1.05 | +184 bearers (+6.3%) | Down 229 places |
| 2020 | #10,278 | 2,983 | 1.00 | -128 bearers (-4.1%) | Up 80 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 Mannion 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 | #10,358 | #10,278 | 0.8% |
| Count | 3,111 | 2,983 | -4.1% |
| Per 100K | 1.05 | 1.00 | -5.0% |
Between the 2010 and 2020 Census, the number of Mannion bearers went from 3,111 to 2,983 (-4.1% change). The surname moved up 80 positions in the national ranking, going from #10,358 to #10,278.
FAQ
Mannion surname: questions and answers
How many people in the U.S. have the surname Mannion?
Name Census estimates that about 3,421 living Americans carry the surname Mannion. Using the current population baseline, that works out to roughly 1 in 100,191 residents.
How common is Mannion?
Mannion ranks #10,278 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 1.00 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 2,983 people with the surname Mannion. That is different from the site's living-bearer estimate (3,421), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 1 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 1.00 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 Mannion.
Has Mannion become more or less common over time?
Between 2010 and 2020, the surname Mannion went from 3,111 recorded bearers to 2,983. That is a decrease of 128 (-4.1%). In the national ranking it rose from #10,358 to #10,278.
What does the Census say about the background of Mannion?
Among Census respondents with the surname Mannion, the largest self-reported group is White at 92.0%. The next largest groups are Hispanic (3.6%) and Two or More Races (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?
White is the largest self-reported group for the surname Mannion in the 2020 Census, accounting for 92.0% (2,744 people in the source table).
What is the full ancestry breakdown?
Mannion appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.0%), Hispanic (3.6%), Two or More Races (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 Mannion (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 Mannion mean?
An Irish surname derived from the Gaelic "Ó Mainnín," meaning "descendant of Mainnín," a personal name meaning "little monk." 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 Mannion (1.00 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 Mannion?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.