Shannon Cahill
There are approximately 21 people named Shannon Cahill living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 16,321,635 Americans.
This estimate combines SSA birth records for the first name Shannon with Census Bureau frequency data for the surname Cahill. Below you will find a breakdown of both names, including popularity trends, gender data, and Census demographics where available.
Expected bearers
21
1 in 16,321,635
Named Shannon
317K
Alive today
Named Cahill
23K
Alive today
US population
343M
Denominator
Estimated living: 317K
Rarity: Common
Gender: Unisex
Peak year: 1970
Average age: 46
Top Census group: White (83.0%)
Estimated bearers: 23K
Rarity: Uncommon
Census rank: #1,738
Per 100K: 6.72
Top ancestry: White (91.7%)
First name trend
Shannon: popularity over time
Year-by-year SSA birth registrations for the first name Shannon. The peak year was 1970 with 16,118 births. The average person named Shannon today is 46 years old.
Babies born per year
Demographics
Ancestry and ethnicity for Shannon
Self-reported race and ethnicity breakdown for people with the first name Shannon, from the 2020 US Census Bureau first-name tables. The largest published group is White at 83.0%.
The bar chart below shows how people with the first name Shannon 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 Shannon at the time of the Census. A first name does not determine a person's race or ethnicity.
- White83.0% · 249,808
- Black or African American8.1% · 24,301
- Two or more races3.7% · 11,184
- Hispanic or Latino3.1% · 9,314
- Asian and Pacific Islander1.2% · 3,588
- American Indian and Alaska Native0.9% · 2,779
Ethnicity
Ancestry of the Cahill surname
Self-reported race and ethnicity breakdown for people with the surname Cahill, from the 2020 US Census Bureau. The largest group is White at 91.7%.
The bar chart below shows how people with the surname Cahill 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 Cahill at the time of the Census. A surname does not determine a person's race or ethnicity.
- White91.7% · 18,425
- Hispanic or Latino3.4% · 684
- Two or more races2.7% · 547
- Black or African American1.2% · 235
- Asian and Pacific Islander0.8% · 158
- American Indian and Alaska Native0.2% · 49
Methodology
How we calculated this
The first name Shannon has a living-bearer frequency of 0.0925% of the US population, based on 317,066 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 Shannon right now.
The surname Cahill appears at a rate of 6.72 per 100,000 residents in the 2020 Census Bureau surname file, which translates to a frequency of 0.0067%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 21 people with the full name Shannon Cahill. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Shannon
Related
Other people with the surname Cahill
FAQ
Shannon Cahill: questions and answers
How many people are named Shannon Cahill?
We estimate approximately 21 people in the United States share the full name Shannon Cahill. That works out to about 1 in 16,321,635 Americans. This is calculated by combining the first-name frequency (0.0925%) with the surname frequency (6.72 per 100K) against the current US population.
How rare is the name Shannon Cahill?
We classify Shannon Cahill as "Very Rare". About 1 in 16,321,635 Americans share this exact first and last name combination.
Is Shannon a male or female name?
Shannon is predominantly unisex. Out of 348,046 total SSA registrations, 15.0% were male and 85.0% were female. See the full Shannon 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 are named Shannon Cahill?
If you just want to know how many people are called Shannon Cahill, HowManyOfMe.org gives you the headline number in one glance.