2000
#150,436
National surname rank
Recorded bearers 100
First available Census row
Per 100,000 0.04
Very Rare Last name
Ruiloba
A Spanish habitational surname referring to someone from Ruiloba, a town in Cantabria.
According to the 2020 US Census Bureau surname tables, roughly 116 Americans carry the last name Ruiloba. That puts it at #155,270 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 2,954,779 residents).
This page is the full Name Census profile for the Ruiloba 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
116
1 in 2,954,779
Census rank
#155,270
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
101
very rare in the US
Popularity narrative
The Census Bureau recorded 101 bearers of the surname Ruiloba in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 155270th position in the national surname ranking.
Among Census respondents with the surname Ruiloba, the largest self-reported group is Hispanic at 85.1%. The next largest groups are White (11.9%) and Black (1.0%).
Origin
Meaning and origin of Ruiloba
The surname RUILOBA is of Spanish origin, derived from the name of a small town located in the region of Cantabria in northern Spain. The town's name, Ruiloba, comes from the Latin phrase "rivulus lovae," which means "stream of the wolf."
The earliest known record of the surname RUILOBA dates back to the 13th century, when it was mentioned in a document from the town of Ruiloba. In this document, a man named Pedro Ruiloba was listed as a landowner in the area.
During the medieval period, the RUILOBA family was known to be prominent in the region of Cantabria. In the 15th century, a member of the family named Juan Ruiloba was a respected scholar and writer who authored several works on the history and culture of the region.
In the 16th century, the RUILOBA name gained further prominence when a member of the family, Diego Ruiloba, served as a captain in the Spanish Armada during the attempted invasion of England in 1588.
One of the most famous individuals with the surname RUILOBA was Rodrigo Ruiloba (1615-1678), a Spanish painter who was renowned for his religious works and portraits. His paintings can be found in churches and museums throughout Spain.
Another notable person with the RUILOBA surname was Juana Ruiloba (1720-1798), a Spanish nun who was known for her work in educating young women in the region of Cantabria. She founded several schools and convents during her lifetime.
In the 19th century, a man named Lucio Ruiloba (1832-1904) gained fame as a successful businessman and philanthropist in the city of Santander, the capital of Cantabria. He donated a significant portion of his wealth to various charitable organizations and helped establish several schools and hospitals in the region.
While the RUILOBA surname is primarily associated with Spain, particularly the region of Cantabria, it has also spread to other parts of the world through migration and immigration. However, the earliest recorded examples of the name can be traced back to the town of Ruiloba in northern Spain.
Demographics
Ancestry and ethnicity for Ruiloba
Among Census respondents with the surname Ruiloba, the largest self-reported group is Hispanic at 85.1%. The next largest groups are White (11.9%) and Black (1.0%).
The bar chart below shows how Ruiloba 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 Ruiloba surname at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino85.1% · 86
- White11.9% · 12
- Black or African American1.0% · 1
- American Indian and Alaska Native1.0% · 1
- Two or more races1.0% · 1
Timeline
Historical Census data for Ruiloba
Ruiloba 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
#145,220
National surname rank
Recorded bearers 114
+14 bearers (+14.0%)
Per 100,000 0.04
Rank movement Up 5,216 places
2020
#155,270
National surname rank
Recorded bearers 101
-13 bearers (-11.4%)
Per 100,000 0.03
Rank movement Down 10,050 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #150,436 | 100 | 0.04 | First available Census row | First available Census row |
| 2010 | #145,220 | 114 | 0.04 | +14 bearers (+14.0%) | Up 5,216 places |
| 2020 | #155,270 | 101 | 0.03 | -13 bearers (-11.4%) | Down 10,050 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 Ruiloba 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 | #145,220 | #155,270 | -6.9% |
| Count | 114 | 101 | -11.4% |
| Per 100K | 0.04 | 0.03 | -15.5% |
Between the 2010 and 2020 Census, the number of Ruiloba bearers went from 114 to 101 (-11.4% change). The surname moved down 10,050 positions in the national ranking, going from #145,220 to #155,270.
FAQ
Ruiloba surname: questions and answers
How many people in the U.S. have the surname Ruiloba?
Name Census estimates that about 116 living Americans carry the surname Ruiloba. Using the current population baseline, that works out to roughly 1 in 2,954,779 residents.
How common is Ruiloba?
Ruiloba ranks #155,270 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 101 people with the surname Ruiloba. That is different from the site's living-bearer estimate (116), 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 Ruiloba.
Has Ruiloba become more or less common over time?
Between 2010 and 2020, the surname Ruiloba went from 114 recorded bearers to 101. That is a decrease of 13 (-11.4%). In the national ranking it fell from #145,220 to #155,270.
What does the Census say about the background of Ruiloba?
Among Census respondents with the surname Ruiloba, the largest self-reported group is Hispanic at 85.1%. The next largest groups are White (11.9%) and Black (1.0%). 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?
Hispanic is the largest self-reported group for the surname Ruiloba in the 2020 Census, accounting for 85.1% (86 people in the source table).
What is the full ancestry breakdown?
Ruiloba appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Hispanic (85.1%), White (11.9%), Black (1.0%). 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 Ruiloba (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 Ruiloba mean?
A Spanish habitational surname referring to someone from Ruiloba, a town in Cantabria. 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 Ruiloba (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 Americans have the surname Ruiloba?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.