2000
#142,819
National surname rank
Recorded bearers 107
First available Census row
Per 100,000 0.04
Very Rare Last name
Marnon
A French surname derived from a diminutive form of the given name Marner.
According to the 2020 US Census Bureau surname tables, roughly 110 Americans carry the last name Marnon. That puts it at #156,540 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 3,115,949 residents).
This page is the full Name Census profile for the Marnon 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
110
1 in 3,115,949
Census rank
#156,540
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
96
very rare in the US
Popularity narrative
The Census Bureau recorded 96 bearers of the surname Marnon in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 156540th position in the national surname ranking.
Among Census respondents with the surname Marnon, the largest self-reported group is White at 96.9%. The next largest groups are Hispanic (3.1%).
Origin
Meaning and origin of Marnon
The surname Marnon has its origins in France, dating back to the 12th century. It is believed to have derived from the Old French word "marne," which meant "marl" or a type of clay soil. The name was likely an occupational surname given to individuals who worked with marl, either in the mining or processing of this material.
One of the earliest recorded instances of the name Marnon can be found in the Cartulaire de l'Abbaye de Savigny, a collection of charters and manuscripts from the 12th century. In this document, a certain Renaud Marnon is mentioned as a witness to a land transaction in the year 1179.
The name Marnon also appears in the Livre des Métiers, a medieval book that recorded the various trades and professions in Paris during the 13th century. This suggests that individuals bearing this surname were likely involved in the mining or processing of marl, which was used in construction and agriculture.
In the 14th century, the name Marnon was associated with the village of Marnon in the Auvergne region of central France. It is possible that the surname originated from this place name, which itself may have derived from the presence of marl in the area.
One notable bearer of the surname Marnon was Jean Marnon (1550-1620), a French mathematician and astronomer who made significant contributions to the development of logarithms. He was born in the town of Marnon-sur-Meuse and served as a professor at the University of Paris.
Another individual of note was Étienne Marnon (1670-1745), a French architect and engineer who worked on several notable buildings in Paris, including the Palais Bourbon and the Église Saint-Sulpice.
In the 18th century, Pierre Marnon (1720-1789) was a French botanist and naturalist who made important contributions to the study of plant taxonomy. He was a member of the Académie des Sciences and authored several works on the flora of France.
During the French Revolution, Antoine Marnon (1755-1795) was a prominent military leader who served in the French Revolutionary Wars. He rose to the rank of general and played a crucial role in several battles before being killed in action.
In the 19th century, Jules Marnon (1820-1892) was a French painter known for his landscapes and genre scenes. He studied under the renowned artist Jean-Auguste-Dominique Ingres and exhibited his works at the prestigious Paris Salon.
Demographics
Ancestry and ethnicity for Marnon
Among Census respondents with the surname Marnon, the largest self-reported group is White at 96.9%. The next largest groups are Hispanic (3.1%).
The bar chart below shows how Marnon 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 Marnon surname at the time of the 2020 Census, not any inherent property of the name itself.
- White96.9% · 93
- Hispanic or Latino3.1% · 3
Timeline
Historical Census data for Marnon
Marnon 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
#153,769
National surname rank
Recorded bearers 106
-1 bearers (-0.9%)
Per 100,000 0.04
Rank movement Down 10,950 places
2020
#156,540
National surname rank
Recorded bearers 96
-10 bearers (-9.4%)
Per 100,000 0.03
Rank movement Down 2,771 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #142,819 | 107 | 0.04 | First available Census row | First available Census row |
| 2010 | #153,769 | 106 | 0.04 | -1 bearers (-0.9%) | Down 10,950 places |
| 2020 | #156,540 | 96 | 0.03 | -10 bearers (-9.4%) | Down 2,771 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 Marnon 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 | #153,769 | #156,540 | -1.8% |
| Count | 106 | 96 | -9.4% |
| Per 100K | 0.04 | 0.03 | -19.7% |
Between the 2010 and 2020 Census, the number of Marnon bearers went from 106 to 96 (-9.4% change). The surname moved down 2,771 positions in the national ranking, going from #153,769 to #156,540.
FAQ
Marnon surname: questions and answers
How many people in the U.S. have the surname Marnon?
Name Census estimates that about 110 living Americans carry the surname Marnon. Using the current population baseline, that works out to roughly 1 in 3,115,949 residents.
How common is Marnon?
Marnon ranks #156,540 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.03 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 96 people with the surname Marnon. That is different from the site's living-bearer estimate (110), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.03 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.03 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 Marnon.
Has Marnon become more or less common over time?
Between 2010 and 2020, the surname Marnon went from 106 recorded bearers to 96. That is a decrease of 10 (-9.4%). In the national ranking it fell from #153,769 to #156,540.
What does the Census say about the background of Marnon?
Among Census respondents with the surname Marnon, the largest self-reported group is White at 96.9%. The next largest groups are Hispanic (3.1%). 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 Marnon in the 2020 Census, accounting for 96.9% (93 people in the source table).
What is the full ancestry breakdown?
Marnon appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (96.9%), Hispanic (3.1%). 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 Marnon (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 Marnon mean?
A French surname derived from a diminutive form of the given name Marner. 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 Marnon (0.03 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 are called Marnon?
Find out how many Americans have the surname Marnon on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.