How Many People Are Named Isobel?
An estimated 2,517 people in the United States have the first name Isobel. It is almost exclusively a female name. The average bearer is 18 years old, and Isobel peaked in popularity in 2016 with 129 births that year.
Below you will find a full statistical profile of Isobel as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Isobel paired with any surname.
Estimated Living Americans
2,517
About 1 in 136,176 people in the U.S.
Rarity
Rare
Predicted Gender
Female
100.0% confidence
Average Age
18
years old
Peak Year
2016
129 births
Total Registered
3,722
since 1880
Gender Distribution for Isobel
Isobel is almost exclusively a female name. Out of 3,722 total births registered, 100.0% were female.
Isobel as a female name
Ranked #2,351 in 2024
78 female births in 2024
Peak: 2016 (129 births)
Isobel: Popularity Over Time
SSA records for Isobel span from the 1890s to the 2020s, covering 14 decades of naming data. The most popular decade for this name was the 2010s, when 981 babies were registered. While Isobel is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Isobel by Decade
How has Isobel tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Isobel by State
Birth registrations for Isobel span all 20 states and territories in the SSA database. The highest counts are in California, New York, Pennsylvania. The lowest are in West Virginia, Indiana, Arizona. On average, about 62 Isobels were registered per state.
Isobel + Last Name Combinations
How many people share a full name with Isobel as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Isobel
Other first names starting with I with a similar number of bearers.
Isobel: Questions and Answers
How many people in the U.S. are named Isobel?
We estimate approximately 2,517 people named Isobel are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 136,176 Americans share this first name.
Is Isobel a common name?
Isobel is classified as "Rare" and is more popular than 94.6% of all first names in the SSA database. A total of 3,722 births have been registered with this name since 1880.
When was Isobel most popular?
Isobel reached peak popularity in 2016, when 129 babies were given this name. The average age of a living person named Isobel is approximately 18 years old, reflecting when the name was most commonly given.
Is Isobel a female name?
Isobel is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Isobel Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Isobel Smith, Isobel Johnson, Isobel Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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