Luis Castillo
There are approximately 211 people named Luis Castillo living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 1,624,428 Americans.
This estimate combines SSA birth records for the first name Luis with Census Bureau frequency data for the surname Castillo. Below you will find a breakdown of both names, including popularity trends, gender data, and Census demographics where available.
Expected bearers
211
1 in 1,624,428
Named Luis
272K
Alive today
Named Castillo
265K
Alive today
US population
343M
Denominator
Estimated living: 272K
Rarity: Common
Gender: Male
Peak year: 2007
Average age: 31
Top Census group: Hispanic or Latino (96.2%)
Estimated bearers: 265K
Rarity: Common
Census rank: #94
Per 100K: 77.40
Top ancestry: Hispanic (89.4%)
First name trend
Luis: popularity over time
Year-by-year SSA birth registrations for the first name Luis. The peak year was 2007 with 8,066 births. The average person named Luis today is 31 years old.
Babies born per year
Demographics
Ancestry and ethnicity for Luis
Self-reported race and ethnicity breakdown for people with the first name Luis, from the 2020 US Census Bureau first-name tables. The largest published group is Hispanic or Latino at 96.2%.
The bar chart below shows how people with the first name Luis described their own race and ethnicity on the 2020 Census form. These are self-reported numbers, and they describe the population who happened to carry the name Luis at the time of the Census. A first name does not determine a person's race or ethnicity.
- Hispanic or Latino96.2% · 471,467
- White2.6% · 12,541
- Asian and Pacific Islander0.6% · 2,730
- Black or African American0.5% · 2,220
- Two or more races0.1% · 529
- American Indian and Alaska Native0.1% · 480
Ethnicity
Ancestry of the Castillo surname
Self-reported race and ethnicity breakdown for people with the surname Castillo, from the 2020 US Census Bureau. The largest group is Hispanic at 89.4%.
The bar chart below shows how people with the surname Castillo described their own race and ethnicity on the 2020 Census form. These are self-reported numbers, and they describe the population who happened to carry the surname Castillo at the time of the Census. A surname does not determine a person's race or ethnicity.
- Hispanic or Latino89.4% · 206,850
- White5.2% · 11,958
- Asian and Pacific Islander3.4% · 7,898
- Black or African American0.8% · 1,942
- Two or more races0.6% · 1,368
- American Indian and Alaska Native0.6% · 1,331
Methodology
How we calculated this
The first name Luis has a living-bearer frequency of 0.0795% of the US population, based on 272,444 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
Even though the Census Bureau now publishes first-name tables, we do not use that file as the main first-name input for this estimate. The latest first-name Census snapshot is from 2020, which makes it 6 years old today. Because Census first-name data is only released once every 10 years, SSA birth records plus CDC survival rates give a better current estimate of how many people are likely alive with the name Luis right now.
The surname Castillo appears at a rate of 77.40 per 100,000 residents in the 2020 Census Bureau surname file, which translates to a frequency of 0.0774%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 211 people with the full name Luis Castillo. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Luis
Related
Other people with the surname Castillo
FAQ
Luis Castillo: questions and answers
How many people are named Luis Castillo?
We estimate approximately 211 people in the United States share the full name Luis Castillo. That works out to about 1 in 1,624,428 Americans. This is calculated by combining the first-name frequency (0.0795%) with the surname frequency (77.40 per 100K) against the current US population.
How rare is the name Luis Castillo?
We classify Luis Castillo as "Very Rare". About 1 in 1,624,428 Americans share this exact first and last name combination.
Is Luis a male or female name?
Luis is predominantly male. Out of 291,974 total SSA registrations, 99.5% were male and 0.5% were female. See the full Luis profile for detailed gender data.
Where does this data come from?
First-name data comes from the Social Security Administration's national baby name files (1880 to 2024). Surname data comes from the 2020 US Census Bureau decennial surname tables. Living-bearer estimates use CDC actuarial life tables to adjust for mortality. Read the full methodology.
How common is the name Luis Castillo?
See how common the name Luis Castillo is on HowManyOfMe.org, our sister site built around that single question.