2000
#130,443
National surname rank
Recorded bearers 120
First available Census row
Per 100,000 0.04
Very Rare Last name
Louy
A variant spelling of the French surname Louet, derived from a diminutive form of Louis.
According to the 2020 US Census Bureau surname tables, roughly 125 Americans carry the last name Louy. That puts it at #150,205 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,742,035 residents).
This page is the full Name Census profile for the Louy 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
125
1 in 2,742,035
Census rank
#150,205
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
109
very rare in the US
Popularity narrative
The Census Bureau recorded 109 bearers of the surname Louy in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 150205th position in the national surname ranking.
Among Census respondents with the surname Louy, the largest self-reported group is White at 81.7%. The next largest groups are Asian/Pacific Islander (8.3%) and Two or More Races (8.3%).
Origin
Meaning and origin of Louy
The surname LOUY has its origins in France, with its earliest recorded use dating back to the 12th century. The name is believed to be derived from the Old French word "lou," meaning wolf, possibly referencing a characteristic or occupation associated with wolves.
One of the earliest recorded instances of the name LOUY can be found in the Cartulaire de l'Abbaye de Saint-Père de Chartres, a medieval manuscript from the 12th century, where a person named Gervais LOUY is mentioned. This suggests that the name was already in use in the region of Chartres, France, during that time period.
In the 13th century, there are records of a noble family bearing the name LOUY in the region of Normandy, France. This family is believed to have originated from the village of Louviers, which may have influenced the spelling and pronunciation of their surname.
During the 14th century, the name LOUY appeared in various medieval records and documents across different regions of France, including the Parisian tax rolls and the Livre des Bourgeois de Reims, indicating its spread throughout the country.
Notable individuals with the surname LOUY include:
1. Jean LOUY (c. 1490 - 1570), a French merchant and diplomat who served as the French ambassador to England during the reign of King Henry VIII.
2. Pierre LOUY (1550 - 1620), a French playwright and poet known for his works in the Renaissance period.
3. Marie-Anne LOUY (1635 - 1705), a French noblewoman and philanthropist who founded several charitable organizations in Paris.
4. Jacques LOUY (1720 - 1789), a French military officer who served in the French Army during the Seven Years' War and the American Revolutionary War.
5. Émile LOUY (1820 - 1892), a French engineer and inventor who patented several innovations in the field of textile manufacturing.
The surname LOUY has also been associated with various place names in France, such as Louviers, Louville, and Louvergny, which may have influenced the spelling and pronunciation of the name in different regions.
Demographics
Ancestry and ethnicity for Louy
Among Census respondents with the surname Louy, the largest self-reported group is White at 81.7%. The next largest groups are Asian/Pacific Islander (8.3%) and Two or More Races (8.3%).
The bar chart below shows how Louy 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 Louy surname at the time of the 2020 Census, not any inherent property of the name itself.
- White81.7% · 89
- Asian and Pacific Islander8.3% · 9
- Two or more races8.3% · 9
- Hispanic or Latino1.8% · 2
Timeline
Historical Census data for Louy
Louy 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
#148,347
National surname rank
Recorded bearers 111
-9 bearers (-7.5%)
Per 100,000 0.04
Rank movement Down 17,904 places
2020
#150,205
National surname rank
Recorded bearers 109
-2 bearers (-1.8%)
Per 100,000 0.04
Rank movement Down 1,858 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #130,443 | 120 | 0.04 | First available Census row | First available Census row |
| 2010 | #148,347 | 111 | 0.04 | -9 bearers (-7.5%) | Down 17,904 places |
| 2020 | #150,205 | 109 | 0.04 | -2 bearers (-1.8%) | Down 1,858 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 Louy 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 | #148,347 | #150,205 | -1.3% |
| Count | 111 | 109 | -1.8% |
| Per 100K | 0.04 | 0.04 | -8.8% |
Between the 2010 and 2020 Census, the number of Louy bearers went from 111 to 109 (-1.8% change). The surname moved down 1,858 positions in the national ranking, going from #148,347 to #150,205.
FAQ
Louy surname: questions and answers
How many people in the U.S. have the surname Louy?
Name Census estimates that about 125 living Americans carry the surname Louy. Using the current population baseline, that works out to roughly 1 in 2,742,035 residents.
How common is Louy?
Louy ranks #150,205 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 109 people with the surname Louy. That is different from the site's living-bearer estimate (125), 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 Louy.
Has Louy become more or less common over time?
Between 2010 and 2020, the surname Louy went from 111 recorded bearers to 109. That is a decrease of 2 (-1.8%). In the national ranking it fell from #148,347 to #150,205.
What does the Census say about the background of Louy?
Among Census respondents with the surname Louy, the largest self-reported group is White at 81.7%. The next largest groups are Asian/Pacific Islander (8.3%) and Two or More Races (8.3%). 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 Louy in the 2020 Census, accounting for 81.7% (89 people in the source table).
What is the full ancestry breakdown?
Louy appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (81.7%), Asian/Pacific Islander (8.3%), Two or More Races (8.3%). 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 Louy (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 Louy mean?
A variant spelling of the French surname Louet, derived from a diminutive form of Louis. 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 Louy (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 common is the surname Louy?
You can see how common the surname Louy is on our sister site HowManyOfMe.org — same data roots, lighter UI.