Cathy Moriarty
There are approximately 4 people named Cathy Moriarty living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 85,688,585 Americans.
This estimate combines SSA birth records for the first name Cathy with Census Bureau frequency data for the surname Moriarty. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Expected bearers
4
1 in 85,688,585
Named Cathy
127K
Alive today
Named Moriarty
12K
Alive today
US population
343M
Denominator
Estimated living: 127K
Rarity: Common
Gender: Female
Peak year: 1958
Average age: 65
Estimated bearers: 12K
Rarity: Uncommon
Census rank: #3,564
Per 100K: 3.39
Top ancestry: White (95.8%)
First name trend
Cathy: popularity over time
Year-by-year SSA birth registrations for the first name Cathy. The peak year was 1958 with 10,961 births. The average person named Cathy today is 65 years old.
Babies born per year
Ethnicity
Ancestry of the Moriarty surname
Self-reported race and ethnicity breakdown for people with the surname Moriarty, from the 2010 US Census Bureau. The largest group is White at 95.8%.
- White95.8%
- Hispanic or Latino1.9%
- Two or more races1.1%
- Asian and Pacific Islander0.6%
- Black or African American0.4%
- American Indian and Alaska Native0.2%
Methodology
How we calculated this
The first name Cathy has a living-bearer frequency of 0.0369% of the US population, based on 126,557 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
The surname Moriarty appears at a rate of 3.39 per 100,000 residents in the 2010 Census Bureau surname file, which translates to a frequency of 0.0034%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 4 people with the full name Cathy Moriarty. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Cathy
FAQ
Cathy Moriarty: questions and answers
How many people are named Cathy Moriarty?
We estimate approximately 4 people in the United States share the full name Cathy Moriarty. That works out to about 1 in 85,688,585 Americans. This is calculated by combining the first-name frequency (0.0369%) with the surname frequency (3.39 per 100K) against the current US population.
How rare is the name Cathy Moriarty?
We classify Cathy Moriarty as "Very Rare". About 1 in 85,688,585 Americans share this exact first and last name combination.
Is Cathy a male or female name?
Cathy is predominantly female. Out of 170,634 total SSA registrations, 0.2% were male and 99.8% were female. See the full Cathy 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 2010 US Census Bureau decennial surname tables. Living-bearer estimates use CDC actuarial life tables to adjust for mortality. Read the full methodology.