2010
#148,347
National surname rank
Recorded bearers 111
First available Census row
Per 100,000 0.04
Very Rare Last name
Laplanche
A French topographic surname denoting someone who lived near a plank bridge.
According to the 2020 US Census Bureau surname tables, roughly 125 Americans carry the last name Laplanche. 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 Laplanche 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 Laplanche 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 Laplanche, the largest self-reported group is Black at 45.9%. The next largest groups are White (41.3%) and Hispanic (11.0%).
Origin
Meaning and origin of Laplanche
The surname Laplanche is of French origin, derived from the Old French "la planche" meaning "the plank" or "the board." It likely originated as a descriptive name for someone who lived near a wooden bridge, a mill, or another structure made of planks.
The earliest recorded instances of the name Laplanche date back to the 12th century in various regions of France, particularly in the central and western parts of the country. The name is found in medieval records such as tax rolls, land surveys, and local archives.
One notable early bearer of the name was Jean Laplanche, a merchant from the city of Limoges in the late 13th century. He was mentioned in several trade records and contracts from that period.
In the 14th century, the name Laplanche appeared in the records of the Duchy of Burgundy, where a certain Guillaume Laplanche was listed as a landowner in the village of Semur-en-Auxois.
During the Renaissance period, the name Laplanche gained some prominence with Jean de Laplanche, a French poet and playwright born in 1549 in the town of Loudun. He was known for his verse plays and his contributions to the development of French literature.
Another notable figure was Pierre Laplanche, a French philosopher and psychoanalyst born in 1924. He made significant contributions to the field of psychoanalytic theory and is best known for his work on the concept of the "Unconscious" and his interpretations of Sigmund Freud's ideas.
In the 18th century, the name Laplanche was associated with a family of architects and builders from the city of Lyon. Jacques Laplanche (1707-1789) and his son, Jean-Baptiste Laplanche (1738-1812), were renowned for their skills in designing and constructing churches, public buildings, and private residences in the region.
The surname Laplanche has also been found in various historical records and manuscripts throughout France, including parish registers, census records, and legal documents. It has been present in different variations, such as Laplanche, La Planche, and Laplanches, reflecting regional linguistic differences.
Demographics
Ancestry and ethnicity for Laplanche
Among Census respondents with the surname Laplanche, the largest self-reported group is Black at 45.9%. The next largest groups are White (41.3%) and Hispanic (11.0%).
The bar chart below shows how Laplanche 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 Laplanche surname at the time of the 2020 Census, not any inherent property of the name itself.
- Black or African American45.9% · 50
- White41.3% · 45
- Hispanic or Latino11.0% · 12
- Asian and Pacific Islander0.9% · 1
- Two or more races0.9% · 1
Timeline
Historical Census data for Laplanche
Laplanche 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
#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 |
|---|---|---|---|---|---|
| 2010 | #148,347 | 111 | 0.04 | First available Census row | First available Census row |
| 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 Laplanche 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 Laplanche 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
Laplanche surname: questions and answers
How many people in the U.S. have the surname Laplanche?
Name Census estimates that about 125 living Americans carry the surname Laplanche. Using the current population baseline, that works out to roughly 1 in 2,742,035 residents.
How common is Laplanche?
Laplanche 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 Laplanche. 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 Laplanche.
Has Laplanche become more or less common over time?
Between 2010 and 2020, the surname Laplanche 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 Laplanche?
Among Census respondents with the surname Laplanche, the largest self-reported group is Black at 45.9%. The next largest groups are White (41.3%) and Hispanic (11.0%). 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?
Black is the largest self-reported group for the surname Laplanche in the 2020 Census, accounting for 45.9% (50 people in the source table).
What is the full ancestry breakdown?
Laplanche appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Black (45.9%), White (41.3%), Hispanic (11.0%). 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 Laplanche (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 Laplanche mean?
A French topographic surname denoting someone who lived near a plank bridge. 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 Laplanche (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 many people share the surname Laplanche?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.