Castulo
An uncommon Spanish masculine name of ancient origin, possibly referring to a castle or fortress.
Name Census estimates that about 46 living Americans carry the first name Castulo. The name is used almost exclusively for boys. The average person named Castulo today is around 58 years old, and the year with the single highest number of Castulo births was 1924 (9 babies).
This page is the full Name Census profile for Castulo. Below you will find a gender breakdown showing how the name splits between male and female registrations, a year-by-year popularity chart stretching back to 1880, decade-level totals, the top US states for this name, its meaning and etymology, and a set of frequently asked questions with data-backed answers.
Key insights
- • Fewer than 100 living Americans are believed to carry the name Castulo. It is among the rarest names in the SSA records.
People living today
46
~ 1 in 7,451,181 Americans
Peak year
1924
9 babies that year
Average age
58
years old
2018 SSA rank
#12,492
Tracked since 1914
Census
Castulo in the 2020 Census
The 2020 Census recorded 505 people with the first name Castulo, which placed it at #20,449 in the published first-name tables. This is a snapshot of people who already had the name at the time of the Census.
The SSA sections elsewhere on this page answer a different question: how often parents gave the name to babies over time. The "people living today" figure on this page is different again: it is a current estimate built from SSA birth records and age-based survival rates, so the two numbers are not expected to match exactly.
2020 Census rank
#20,449
National first-name rank
People counted
505
505 in the published race/origin table
Per 100,000
0.2
People with this name in 2020
Largest reported group
Hispanic or Latino
95.6% of people with this name
Demographics
Ancestry and ethnicity for Castulo
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Castulo is Hispanic at 95.6%. The next largest groups are White (2.0%) and Asian/Pacific Islander (1.6%). These figures describe the people who had the name in 2020, not any inherent property of the name itself.
The bar chart below shows how people with the first name Castulo 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 name, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown so the breakdown is easy to read across every published category. Because the 2020 Census first-name file also includes raw headcounts for each group, Name Census can show those alongside the percentages in the legend and hover tooltip.
Keep in mind that these are self-reported numbers. A first name does not determine a person's race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the name Castulo at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino95.6% · 483
- White2.0% · 10
- Asian and Pacific Islander1.6% · 8
- American Indian and Alaska Native0.8% · 4
Popularity
Castulo: popularity over time
The SSA tracks Castulo from the 1910s through to the 2010s, spanning 9 decades of birth certificate data. The biggest single decade for the name was the 1920s, with 43 total registrations. Usage has dropped considerably from its 1920s peak. The most recent decade brought in only a fraction of the registrations that the name once attracted.
Babies born per year
Decades
Castulo by decade
The table below breaks the full SSA timeline into ten-year windows. Each row shows how many male and female babies were given the name Castulo during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
Geography
Where Castulos live
Origin
Meaning and history of Castulo
The given name Castulo has its origins in ancient Iberian culture, specifically among the Celtiberian tribes that inhabited the central and eastern regions of the Iberian Peninsula during the Iron Age. The name is derived from the Latin word "castellum," which means "fortified village" or "castle," suggesting a connection to a significant settlement or stronghold.
One of the earliest recorded instances of the name Castulo can be found in the writings of Roman historians, such as Pliny the Elder and Strabo, who mentioned a town called Castulo (modern-day Cazlona) located in the province of Jaén, Spain. This town was an important center for mining and trade during the Roman era, indicating that the name may have held historical significance.
In the 5th century AD, a bishop named Castulo was known to have presided over the Diocese of Baza, located in the province of Granada, Spain. This early Christian figure is one of the earliest recorded individuals to bear the name Castulo.
Another notable individual with this name was Castulo Rodrigo Sánchez, a Spanish nobleman and military leader who lived in the 12th century. He played a crucial role in the reconquest of the Iberian Peninsula from the Moors and was granted lands in the region of La Mancha for his services.
During the 16th century, Castulo Fernández de Bobadilla was a Spanish explorer and conquistador who participated in the conquest of the Yucatán Peninsula in present-day Mexico. He is remembered for his involvement in the subjugation of the Maya people and the establishment of Spanish colonial rule in the region.
In the 18th century, Castulo García de Arista was a Spanish military officer and colonial administrator who served as the governor of the Captaincy General of Guatemala, which encompassed much of present-day Central America.
While the name Castulo has its roots in ancient Iberian culture, it has been used throughout various periods of history, particularly in Spain and Spanish-speaking regions. The name's association with settlements, fortifications, and historical figures suggests a connection to strength, resilience, and historical significance.
People
Castulo + last name combinations
How many people share a full name with Castulo as the first name? Click a combination below to see the estimate, or search any pairing.
Related
Other names starting with C
Other first names starting with C with a similar number of bearers.
FAQ
Castulo: questions and answers
How many people in the U.S. are named Castulo?
Name Census puts the figure at roughly 46 living Americans. We arrive at this by taking every SSA birth registration for Castulo going back to 1880 and adjusting each cohort for expected survival using CDC actuarial life tables. The result is an age-weighted living-bearer count, not a raw birth total. That works out to about 1 in 7,451,181 US residents.
Is Castulo a common name?
We classify Castulo as "Very Rare". It ranks above 53.1% of all first names in the SSA dataset by living bearers. Across the full history of the data, 116 babies have been registered with this name.
When was Castulo most popular?
The single biggest year for Castulo was 1924, when 9 babies received the name. The fact that the average living Castulo is about 58 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
How common was Castulo in the 2020 Census?
The published 2020 Census first-name tables recorded 505 people with the name Castulo, or 0.17 per 100,000 residents. That placed it at #20,449 in the national Census ranking for first names.
Why is the Census count different from the living estimate?
Because they measure different things. The Census figure is a count of people who had the name Castulo in 2020. The living estimate aims to answer a current question instead: how many people with the name are alive today, based on SSA birth records and age-based survival rates. Since one number is a 2020 snapshot and the other is a present-day estimate, they are not expected to be identical.
What does the Census say about the gender split for Castulo?
In the 2020 Census sex table, Castulo leans strongly male. 501 people counted with this name were male (98.6%), compared with 7 female bearers (1.4%). The Census view is a snapshot of people living with the name in 2020, while the SSA section above tracks births across time.
What does the Census say about the background of people named Castulo?
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Castulo is Hispanic at 95.6%. The next largest groups are White (2.0%) and Asian/Pacific Islander (1.6%). These figures describe the people who had the name in 2020, not any inherent property of the name itself. The percentages in the chart above come from self-reported race and Hispanic-origin responses in the 2020 Census.
Which group reports the name Castulo most often in the Census?
Hispanic is the largest reported group for people named Castulo in the 2020 Census, accounting for 95.6% (483 people in the published table).
Why can the Census sex total and race total differ slightly?
The Census Bureau published separate 2020 tables for sex and for race/Hispanic origin, and the released figures can differ slightly because of privacy protection in the public files. That is why this page treats the gender section and the race/origin section as two related snapshots instead of forcing them into one identical total.
Does every first name have Census demographic data?
No. The public Census first-name release only includes names that met the Bureau's publication rules, so many rarer names in the SSA files have no Census demographic snapshot. When that happens, the SSA trend, gender history, and state sections still appear, but the 2020 Census demographic sections are omitted.
What does the SSA popularity chart show?
The chart tracks births, not the number of people alive with the name today. Each point shows how many babies were given the name Castulo in that year. That makes it useful for spotting when the name rose, peaked, or faded.
Is Castulo a male name?
Yes, 100.0% of people registered as Castulo in the SSA data are male. You can see the full per-sex comparison in the gender distribution section above, which includes the latest year rank, birth count, and peak year for each sex.
Is Castulo still being used today?
Yes. The SSA still recorded Castulo in 2024, and the page above shows its latest-year rank where available. A name can be well past its peak and still remain in steady use, especially if it built up a large population over earlier decades.
Why can a name have a lot of living bearers even if it is not trendy now?
Because living-bearer counts and current baby-name popularity measure different things. A name like Castulo can build up a very large population over many decades, even if fewer parents are choosing it now than they did at its peak.
Where does this data come from?
First-name figures come from the Social Security Administration's national baby name files, which cover every name on a birth certificate from 1880 to 2024. Living-bearer estimates layer in CDC actuarial life tables broken out by sex to account for mortality. The population baseline (342,754,338) is the Census Bureau's latest national estimate. You can read the full calculation on our methodology page.
How many people have the name Castulo?
See how many people share the name Castulo on HowManyOfMe.org, our sister site built around that single question.