Hilary Duff
There are approximately 1 people named Hilary Duff 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 Hilary with Census Bureau frequency data for the surname Duff. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Expected bearers
1
1 in 342,754,338
Named Hilary
23K
Alive today
Named Duff
19K
Alive today
US population
343M
Denominator
Estimated living: 23K
Rarity: Uncommon
Gender: Female
Peak year: 1990
Average age: 44
Estimated bearers: 19K
Rarity: Uncommon
Census rank: #2,202
Per 100K: 5.61
Top ancestry: White (86.2%)
First name trend
Hilary: popularity over time
Year-by-year SSA birth registrations for the first name Hilary. The peak year was 1990 with 1,225 births. The average person named Hilary today is 44 years old.
Babies born per year
Ethnicity
Ancestry of the Duff surname
Self-reported race and ethnicity breakdown for people with the surname Duff, from the 2010 US Census Bureau. The largest group is White at 86.2%.
- White86.2%
- Black or African American9.0%
- Hispanic or Latino2.2%
- Two or more races1.6%
- Asian and Pacific Islander0.8%
- American Indian and Alaska Native0.4%
Methodology
How we calculated this
The first name Hilary has a living-bearer frequency of 0.0066% of the US population, based on 22,760 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
The surname Duff appears at a rate of 5.61 per 100,000 residents in the 2010 Census Bureau surname file, which translates to a frequency of 0.0056%.
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 Hilary Duff. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Hilary
Related
Other people with the surname Duff
FAQ
Hilary Duff: questions and answers
How many people are named Hilary Duff?
We estimate approximately 1 people in the United States share the full name Hilary Duff. That works out to about 1 in 342,754,338 Americans. This is calculated by combining the first-name frequency (0.0066%) with the surname frequency (5.61 per 100K) against the current US population.
How rare is the name Hilary Duff?
We classify Hilary Duff as "Very Rare". About 1 in 342,754,338 Americans share this exact first and last name combination.
Is Hilary a male or female name?
Hilary is predominantly female. Out of 26,341 total SSA registrations, 8.3% were male and 91.7% were female. See the full Hilary 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.