2000
#143,847
National surname rank
Recorded bearers 106
First available Census row
Per 100,000 0.04
Very Rare Last name
Moncibais
Referring to someone from the town of Moncibais in France.
According to the 2020 US Census Bureau surname tables, roughly 136 Americans carry the last name Moncibais. That puts it at #142,788 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,520,252 residents).
This page is the full Name Census profile for the Moncibais 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
136
1 in 2,520,252
Census rank
#142,788
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
119
very rare in the US
Popularity narrative
The Census Bureau recorded 119 bearers of the surname Moncibais in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 142788th position in the national surname ranking.
Among Census respondents with the surname Moncibais, the largest self-reported group is Hispanic at 87.4%. The next largest groups are White (12.6%).
Origin
Meaning and origin of Moncibais
The surname Moncibais has its origins in the Galicia region of northwestern Spain, likely emerging during the early medieval period around the 8th or 9th century. It is believed to be derived from a combination of the Latin words "mons" meaning mountain and "cibalis" meaning food or nourishment. This suggests that the name may have initially referred to someone who lived near a fertile mountain area or worked in a profession related to agricultural production in the mountainous regions.
One of the earliest known records of the Moncibais name appears in the Cartulario de Sobrado, a collection of medieval documents from the Monastery of Santa María de Sobrado in Galicia, dated around the 11th century. The name is also found in various local parish records and land registries from that region during the 12th and 13th centuries.
In the 14th century, a nobleman named Álvaro Moncibais was recorded as serving in the court of King Alfonso XI of Castile (1311-1350). This suggests that by this time, the Moncibais family had achieved a certain level of prominence and status within Spanish society.
During the 16th century, the name appears in several historical documents related to the Spanish exploration and colonization of the Americas. One notable figure was Pedro Moncibais (1525-1598), a sailor and navigator who participated in several voyages to the Caribbean and Central America.
Another significant figure was Juana Moncibais (1570-1632), a scholar and educator from Galicia who was known for her work in promoting literacy and education for women during the Spanish Renaissance.
In the 18th century, a prominent member of the Moncibais family was Rodrigo Moncibais (1712-1784), a successful merchant and landowner from the city of Santiago de Compostela, who played a significant role in the economic development of the region.
Throughout the centuries, variations in the spelling of the name have been observed, including Moncibays, Moncibaiz, and Moncibais-Cibeiro, reflecting the influence of local dialects and regional variations in pronunciation.
While the Moncibais surname is not among the most common in Spain today, it remains an important part of the cultural and historical heritage of the Galicia region, with roots that can be traced back to the early medieval period and a rich legacy that spans several centuries of Spanish history.
Demographics
Ancestry and ethnicity for Moncibais
Among Census respondents with the surname Moncibais, the largest self-reported group is Hispanic at 87.4%. The next largest groups are White (12.6%).
The bar chart below shows how Moncibais 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 Moncibais surname at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino87.4% · 104
- White12.6% · 15
Timeline
Historical Census data for Moncibais
Moncibais 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
#134,712
National surname rank
Recorded bearers 125
+19 bearers (+17.9%)
Per 100,000 0.04
Rank movement Up 9,135 places
2020
#142,788
National surname rank
Recorded bearers 119
-6 bearers (-4.8%)
Per 100,000 0.04
Rank movement Down 8,076 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #143,847 | 106 | 0.04 | First available Census row | First available Census row |
| 2010 | #134,712 | 125 | 0.04 | +19 bearers (+17.9%) | Up 9,135 places |
| 2020 | #142,788 | 119 | 0.04 | -6 bearers (-4.8%) | Down 8,076 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 Moncibais 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 | #134,712 | #142,788 | -6.0% |
| Count | 125 | 119 | -4.8% |
| Per 100K | 0.04 | 0.04 | -0.5% |
Between the 2010 and 2020 Census, the number of Moncibais bearers went from 125 to 119 (-4.8% change). The surname moved down 8,076 positions in the national ranking, going from #134,712 to #142,788.
FAQ
Moncibais surname: questions and answers
How many people in the U.S. have the surname Moncibais?
Name Census estimates that about 136 living Americans carry the surname Moncibais. Using the current population baseline, that works out to roughly 1 in 2,520,252 residents.
How common is Moncibais?
Moncibais ranks #142,788 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 119 people with the surname Moncibais. That is different from the site's living-bearer estimate (136), 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 Moncibais.
Has Moncibais become more or less common over time?
Between 2010 and 2020, the surname Moncibais went from 125 recorded bearers to 119. That is a decrease of 6 (-4.8%). In the national ranking it fell from #134,712 to #142,788.
What does the Census say about the background of Moncibais?
Among Census respondents with the surname Moncibais, the largest self-reported group is Hispanic at 87.4%. The next largest groups are White (12.6%). 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?
Hispanic is the largest self-reported group for the surname Moncibais in the 2020 Census, accounting for 87.4% (104 people in the source table).
What is the full ancestry breakdown?
Moncibais appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Hispanic (87.4%), White (12.6%). 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 Moncibais (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 Moncibais mean?
Referring to someone from the town of Moncibais in France. 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 Moncibais (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 have the last name Moncibais?
For a quick modern take, check how many Americans have the surname Moncibais on our sister site HowManyOfMe.org.