How Many People Are Named 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.
Estimated People with This Name
1
1 in 342,754,338 Americans
Combination Rarity
Very Rare
First Name
View full profileHilary
Last Name
View full profileDuff
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.
Ancestry of the Duff Surname
Self-reported race and ethnicity breakdown for people with the surname Duff, from the 2010 U.S. Census Bureau.
How we calculated this
The first name "Hilary" has an estimated frequency of < 0.0001% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Duff" appears at a rate of 5.61 per 100,000 people in the 2010 U.S. Census.
Multiplying these frequencies against the U.S. population of ~343 million gives 1 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Hilary
Other people with the surname Duff
Hilary Duff: Questions and Answers
How many people are named Hilary Duff?
We estimate approximately 1 people named Hilary Duff are alive in the United States today. The first name Hilary is shared by 22,760 Americans, and the surname Duff is shared by 18,844.
How rare is the name Hilary Duff?
This name combination is classified as Very Rare, occurring at a rate of about 1 in 342,754,338 Americans. The first name Hilary is uncommon and the surname Duff is uncommon.
Is Hilary a male or female name?
Hilary is predominantly female, with 8.3% of bearers being male and 91.7% female. It peaked in popularity in 1990 and the average bearer today is 44 years old.
Where does this data come from?
First name data comes from the Social Security Administration (1880 to 2024), adjusted for survival using CDC 2023 life tables. Surname data comes from the 2010 U.S. Census Bureau. Full methodology.
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