How Many People Are Named Iain?
An estimated 2,822 people in the United States have the first name Iain. It is almost exclusively a male name. The average bearer is 26 years old, and Iain peaked in popularity in 2003 with 126 births that year.
Below you will find a full statistical profile of Iain 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 Iain paired with any surname.
Estimated Living Americans
2,822
About 1 in 121,458 people in the U.S.
Rarity
Rare
Predicted Gender
Male
100.0% confidence
Average Age
26
years old
Peak Year
2003
126 births
Total Registered
2,899
since 1880
Gender Distribution for Iain
Iain is almost exclusively a male name. Out of 2,899 total births registered, 100.0% were male.
Iain as a male name
Ranked #4,227 in 2024
25 male births in 2024
Peak: 2003 (126 births)
Iain: Popularity Over Time
SSA records for Iain span from the 1950s to the 2020s, covering 8 decades of naming data. The most popular decade for this name was the 2000s, when 1,011 babies were registered. Iain has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Iain by Decade
How has Iain 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.
Iain by State
Birth registrations for Iain span all 21 states and territories in the SSA database. The highest counts are in California, Texas, New York. The lowest are in Wisconsin, South Carolina, New Jersey. On average, about 42 Iains were registered per state.
Iain + Last Name Combinations
How many people share a full name with Iain as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Iain
Other first names starting with I with a similar number of bearers.
Iain: Questions and Answers
How many people in the U.S. are named Iain?
We estimate approximately 2,822 people named Iain 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 121,458 Americans share this first name.
Is Iain a common name?
Iain is classified as "Rare" and is more popular than 95% of all first names in the SSA database. A total of 2,899 births have been registered with this name since 1880.
When was Iain most popular?
Iain reached peak popularity in 2003, when 126 babies were given this name. The average age of a living person named Iain is approximately 26 years old, reflecting when the name was most commonly given.
Is Iain a male name?
Iain is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Iain Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Iain Smith, Iain Johnson, Iain 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.
Search for a full name combination
How Many of Me