2000
#13,473
National surname rank
Recorded bearers 2,071
First available Census row
Per 100,000 0.77
Rare Last name
Mannix
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 2,379 Americans carry the last name Mannix. That puts it at #13,921 in the national surname ranking, appearing at a frequency of 0.69 per 100,000 people (about 1 in 144,075 residents).
This page is the full Name Census profile for the Mannix 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 Mannix with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
2.4K
1 in 144,075
Census rank
#13,921
2020 decennial data
Per 100,000
0.7
Frequency rate
Recorded bearers
2.1K
rare in the US
Popularity narrative
The Census Bureau recorded 2,075 bearers of the surname Mannix in its 2020 decennial surname file. At a rate of 0.69 per 100,000 residents, it holds the 13921st position in the national surname ranking.
Among Census respondents with the surname Mannix, the largest self-reported group is White at 92.5%. The next largest groups are Hispanic (3.0%) and Two or More Races (1.8%).
Origin
Meaning and origin of Mannix
The surname Mannix has its origins in Ireland and is derived from the Gaelic name 'Mac an Midhche', meaning 'son of the middle-man' or 'son of the negotiator'. It is believed to have originated in the County Kerry region of southwestern Ireland.
One of the earliest recorded instances of the Mannix surname dates back to the 16th century. In 1589, a John Mannix was documented in the records of the city of Cork, Ireland. The name also appears in the Fiants of the Tudor Sovereigns, a historic collection of records from the 16th and 17th centuries.
The Mannix surname has a strong connection to the Catholic Church in Ireland. In the late 18th century, Michael Mannix (1740-1809) was a prominent Catholic priest and educator who established several schools in County Cork. He played a significant role in promoting Catholic education during a time of religious persecution.
Jeremiah Mannix (1828-1906) was an Irish-American journalist and politician who served as a member of the United States House of Representatives from Indiana from 1869 to 1875. He was also the editor of the Indianapolis Daily Herald newspaper.
Daniel Mannix (1864-1963) was an influential Australian Catholic archbishop who served as the Archbishop of Melbourne from 1917 to 1963. He was a prominent figure in the Irish Catholic community in Australia and was known for his strong advocacy for the Irish nationalist cause.
Another notable figure with the Mannix surname was Brendan Mannix (1909-1987), an Irish-American actor and film producer. He appeared in several films during the 1940s and 1950s, including the classic "The Maltese Falcon" (1941) and "Quo Vadis" (1951).
In the literary world, Mary Mannix (1914-2005) was an American writer and poet who published several collections of poetry and prose. Her works often explored themes of nature, spirituality, and the human experience.
Demographics
Ancestry and ethnicity for Mannix
Among Census respondents with the surname Mannix, the largest self-reported group is White at 92.5%. The next largest groups are Hispanic (3.0%) and Two or More Races (1.8%).
The bar chart below shows how Mannix 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 Mannix surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.5% · 1,919
- Hispanic or Latino3.0% · 62
- Two or more races1.8% · 38
- Black or African American1.7% · 36
- Asian and Pacific Islander0.8% · 16
- American Indian and Alaska Native0.2% · 4
Timeline
Historical Census data for Mannix
Mannix 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
#12,017
National surname rank
Recorded bearers 2,598
+527 bearers (+25.4%)
Per 100,000 0.88
Rank movement Up 1,456 places
2020
#13,921
National surname rank
Recorded bearers 2,075
-523 bearers (-20.1%)
Per 100,000 0.69
Rank movement Down 1,904 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #13,473 | 2,071 | 0.77 | First available Census row | First available Census row |
| 2010 | #12,017 | 2,598 | 0.88 | +527 bearers (+25.4%) | Up 1,456 places |
| 2020 | #13,921 | 2,075 | 0.69 | -523 bearers (-20.1%) | Down 1,904 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 Mannix 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 | #12,017 | #13,921 | -15.8% |
| Count | 2,598 | 2,075 | -20.1% |
| Per 100K | 0.88 | 0.69 | -21.1% |
Between the 2010 and 2020 Census, the number of Mannix bearers went from 2,598 to 2,075 (-20.1% change). The surname moved down 1,904 positions in the national ranking, going from #12,017 to #13,921.
FAQ
Mannix surname: questions and answers
How many people in the U.S. have the surname Mannix?
Name Census estimates that about 2,379 living Americans carry the surname Mannix. Using the current population baseline, that works out to roughly 1 in 144,075 residents.
How common is Mannix?
Mannix ranks #13,921 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 0.69 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 2,075 people with the surname Mannix. That is different from the site's living-bearer estimate (2,379), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.69 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.69 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 Mannix.
Has Mannix become more or less common over time?
Between 2010 and 2020, the surname Mannix went from 2,598 recorded bearers to 2,075. That is a decrease of 523 (-20.1%). In the national ranking it fell from #12,017 to #13,921.
What does the Census say about the background of Mannix?
Among Census respondents with the surname Mannix, the largest self-reported group is White at 92.5%. The next largest groups are Hispanic (3.0%) and Two or More Races (1.8%). 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 Mannix in the 2020 Census, accounting for 92.5% (1,919 people in the source table).
What is the full ancestry breakdown?
Mannix appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.5%), Hispanic (3.0%), Two or More Races (1.8%). 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 Mannix (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 Mannix 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 Mannix (0.69 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 Mannix?
Our sister site HowManyOfMe.org answers how many people are called Mannix at a glance, with the living-bearer count up front.