Cieran Shanahan
There are approximately 1 people named Cieran Shanahan 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 Cieran with Census Bureau frequency data for the surname Shanahan. 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 Cieran
25
Alive today
Named Shanahan
9.7K
Alive today
US population
343M
Denominator
Estimated living: 25
Rarity: Very Rare
Gender: Male
Peak year: 2020
Average age: 6
Estimated bearers: 9.7K
Rarity: Rare
Census rank: #4,078
Per 100K: 2.82
Top ancestry: White (92.2%)
First name trend
Cieran: popularity over time
Year-by-year SSA birth registrations for the first name Cieran. The peak year was 2020 with 8 births. The average person named Cieran today is 6 years old.
Babies born per year
Ethnicity
Ancestry of the Shanahan surname
Self-reported race and ethnicity breakdown for people with the surname Shanahan, from the 2020 US Census Bureau. The largest group is White at 92.2%.
The bar chart below shows how people with the surname Shanahan 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 Shanahan at the time of the Census. A surname does not determine a person's race or ethnicity.
- White92.2% · 7,783
- Hispanic or Latino3.7% · 313
- Two or more races2.5% · 213
- Asian and Pacific Islander0.9% · 78
- Black or African American0.5% · 42
- American Indian and Alaska Native0.2% · 13
Methodology
How we calculated this
The first name Cieran has a living-bearer frequency of 0.0000% of the US population, based on 25 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
The surname Shanahan appears at a rate of 2.82 per 100,000 residents in the 2020 Census Bureau surname file, which translates to a frequency of 0.0028%.
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 Cieran Shanahan. 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 Shanahan
FAQ
Cieran Shanahan: questions and answers
How many people are named Cieran Shanahan?
We estimate approximately 1 people in the United States share the full name Cieran Shanahan. 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 (2.82 per 100K) against the current US population.
How rare is the name Cieran Shanahan?
We classify Cieran Shanahan as "Very Rare". About 1 in 342,754,338 Americans share this exact first and last name combination.
Is Cieran a male or female name?
Cieran is predominantly male. Out of 25 total SSA registrations, 100.0% were male and 0.0% were female. See the full Cieran 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 Cieran Shanahan?
Find out how many people are called Cieran Shanahan on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.