Willoughby Rothrock
There are approximately 1 people named Willoughby Rothrock living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 342,754,338 Americans.
This estimate combines SSA birth records for the first name Willoughby with Census Bureau frequency data for the surname Rothrock. Below you will find a breakdown of both names, including popularity trends, gender data, and Census demographics where available.
Expected bearers
1
1 in 342,754,338
Named Willoughby
157
Alive today
Named Rothrock
3.4K
Alive today
US population
343M
Denominator
Estimated living: 157
Rarity: Very Rare
Gender: Unisex
Peak year: 2021
Average age: 21
Top Census group: White (77.4%)
Estimated bearers: 3.4K
Rarity: Rare
Census rank: #10,308
Per 100K: 0.99
Top ancestry: White (92.2%)
First name trend
Willoughby: popularity over time
Year-by-year SSA birth registrations for the first name Willoughby. The peak year was 2021 with 17 births. The average person named Willoughby today is 21 years old.
Babies born per year
Demographics
Ancestry and ethnicity for Willoughby
Self-reported race and ethnicity breakdown for people with the first name Willoughby, from the 2020 US Census Bureau first-name tables. The largest published group is White at 77.4%.
The bar chart below shows how people with the first name Willoughby 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 Willoughby at the time of the Census. A first name does not determine a person's race or ethnicity.
- White77.4% · 257
- Black or African American10.2% · 34
- Hispanic or Latino5.4% · 18
- Two or more races5.1% · 17
- Asian and Pacific Islander1.5% · 5
- American Indian and Alaska Native0.3% · 1
Ethnicity
Ancestry of the Rothrock surname
Self-reported race and ethnicity breakdown for people with the surname Rothrock, from the 2020 US Census Bureau. The largest group is White at 92.2%.
The bar chart below shows how people with the surname Rothrock 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 Rothrock at the time of the Census. A surname does not determine a person's race or ethnicity.
- White92.2% · 2,743
- Hispanic or Latino3.6% · 106
- Two or more races3.0% · 88
- Asian and Pacific Islander0.8% · 24
- Black or African American0.3% · 9
- American Indian and Alaska Native0.1% · 4
Methodology
How we calculated this
The first name Willoughby has a living-bearer frequency of 0.0000% of the US population, based on 157 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 Willoughby right now.
The surname Rothrock appears at a rate of 0.99 per 100,000 residents in the 2020 Census Bureau surname file, which translates to a frequency of 0.0010%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 1 people with the full name Willoughby Rothrock. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people with the surname Rothrock
FAQ
Willoughby Rothrock: questions and answers
How many people are named Willoughby Rothrock?
We estimate approximately 1 people in the United States share the full name Willoughby Rothrock. That works out to about 1 in 342,754,338 Americans. This is calculated by combining the first-name frequency (0.0000%) with the surname frequency (0.99 per 100K) against the current US population.
How rare is the name Willoughby Rothrock?
We classify Willoughby Rothrock as "Very Rare". About 1 in 342,754,338 Americans share this exact first and last name combination.
Is Willoughby a male or female name?
Willoughby is predominantly unisex. Out of 309 total SSA registrations, 72.2% were male and 27.8% were female. See the full Willoughby 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 many people have the full name Willoughby Rothrock?
Want to know how common the name Willoughby Rothrock is? HowManyOfMe.org, our sister site, puts the living-bearer count front and centre.