How Many People Are Named Siobhan?
An estimated 6,809 people in the United States have the first name Siobhan. It is almost exclusively a female name. The average bearer is 37 years old, and Siobhan peaked in popularity in 1980 with 282 births that year.
Below you will find a full statistical profile of Siobhan 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 Siobhan paired with any surname.
Estimated Living Americans
6,809
About 1 in 50,338 people in the U.S.
Rarity
Rare
Predicted Gender
Female
100.0% confidence
Average Age
37
years old
Peak Year
1980
282 births
Total Registered
7,310
since 1880
Gender Distribution for Siobhan
Siobhan is almost exclusively a female name. Out of 7,310 total births registered, 100.0% were female.
Siobhan as a female name
Ranked #1,931 in 2024
103 female births in 2024
Peak: 1980 (282 births)
Siobhan: Popularity Over Time
SSA records for Siobhan span from the 1950s to the 2020s, covering 8 decades of naming data. The most popular decade for this name was the 1980s, when 2,086 babies were registered. Siobhan has declined significantly from its peak in the 1980s. Recent registrations are a fraction of what they were at the name's height.
Siobhan by Decade
How has Siobhan 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.
Siobhan by State
Birth registrations for Siobhan span all 23 states and territories in the SSA database. The highest counts are in New York, Massachusetts, California. The lowest are in New Mexico, Georgia, Oklahoma. On average, about 211 Siobhans were registered per state.
Siobhan + Last Name Combinations
How many people share a full name with Siobhan as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Siobhan
Other first names starting with S with a similar number of bearers.
Siobhan: Questions and Answers
How many people in the U.S. are named Siobhan?
We estimate approximately 6,809 people named Siobhan 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 50,338 Americans share this first name.
Is Siobhan a common name?
Siobhan is classified as "Rare" and is more popular than 97.1% of all first names in the SSA database. A total of 7,310 births have been registered with this name since 1880.
When was Siobhan most popular?
Siobhan reached peak popularity in 1980, when 282 babies were given this name. The average age of a living person named Siobhan is approximately 37 years old, reflecting when the name was most commonly given.
Is Siobhan a female name?
Siobhan is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Siobhan Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Siobhan Smith, Siobhan Johnson, Siobhan 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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