How Many People Are Named Katharine Isabelle?
There are approximately 1 people named Katharine Isabelle 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 Katharine with Census Bureau frequency data for the surname Isabelle. 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 profileKatharine
Last Name
View full profileIsabelle
Katharine: Popularity Over Time
Year-by-year SSA birth registrations for the first name Katharine. The peak year was 1982 with 947 births. The average person named Katharine today is 45 years old.
Ancestry of the Isabelle Surname
Self-reported race and ethnicity breakdown for people with the surname Isabelle, from the 2010 U.S. Census Bureau.
How we calculated this
The first name "Katharine" 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 "Isabelle" appears at a rate of 0.39 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 Katharine
Katharine Isabelle: Questions and Answers
How many people are named Katharine Isabelle?
We estimate approximately 1 people named Katharine Isabelle are alive in the United States today. The first name Katharine is shared by 26,798 Americans, and the surname Isabelle is shared by 1,310.
How rare is the name Katharine Isabelle?
This name combination is classified as Very Rare, occurring at a rate of about 1 in 342,754,338 Americans. The first name Katharine is uncommon and the surname Isabelle is rare.
Is Katharine a male or female name?
Katharine is predominantly female, with 0.0% of bearers being male and 100.0% female. It peaked in popularity in 1982 and the average bearer today is 45 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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