How Many People Are Named Roisin?
An estimated 905 people in the United States have the first name Roisin. It is almost exclusively a female name. The average bearer is 17 years old, and Roisin peaked in popularity in 2023 with 54 births that year.
Below you will find a full statistical profile of Roisin 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 Roisin paired with any surname.
Estimated Living Americans
905
About 1 in 378,734 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
17
years old
Peak Year
2023
54 births
Total Registered
922
since 1880
Gender Distribution for Roisin
Roisin is almost exclusively a female name. Out of 922 total births registered, 100.0% were female.
Roisin as a female name
Ranked #3,624 in 2024
43 female births in 2024
Peak: 2023 (54 births)
Roisin: Popularity Over Time
SSA records for Roisin span from the 1960s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 2010s, when 276 babies were registered. While Roisin is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Roisin by Decade
How has Roisin 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.
Roisin by State
Birth registrations for Roisin span all 6 states and territories in the SSA database. The highest counts are in New York, California, Massachusetts. The lowest are in Pennsylvania, New Jersey, Illinois. On average, about 37 Roisins were registered per state.
Roisin + Last Name Combinations
How many people share a full name with Roisin as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Roisin
Other first names starting with R with a similar number of bearers.
Roisin: Questions and Answers
How many people in the U.S. are named Roisin?
We estimate approximately 905 people named Roisin 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 378,734 Americans share this first name.
Is Roisin a common name?
Roisin is classified as "Very Rare" and is more popular than 89.5% of all first names in the SSA database. A total of 922 births have been registered with this name since 1880.
When was Roisin most popular?
Roisin reached peak popularity in 2023, when 54 babies were given this name. The average age of a living person named Roisin is approximately 17 years old, reflecting when the name was most commonly given.
Is Roisin a female name?
Roisin is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Roisin Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Roisin Smith, Roisin Johnson, Roisin 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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