How Many People Are Named Io?
An estimated 214 people in the United States have the first name Io. It is used for both genders, with 85.6% female. The average bearer is 11 years old, and Io peaked in popularity in 2022 with 24 births that year.
Below you will find a full statistical profile of Io 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 Io paired with any surname.
Estimated Living Americans
214
About 1 in 1,601,656 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
85.6% confidence
Average Age
11
years old
Peak Year
2022
24 births
Total Registered
216
since 1880
Gender Distribution for Io
Io is predominantly female (85.6%), though 31 male births have been registered. It functions as a unisex name for a small percentage of bearers.
Io as a male name
Ranked #12,949 in 2023
5 male births in 2023
Peak: 2014 (7 births)
Io as a female name
Ranked #9,867 in 2023
10 female births in 2023
Peak: 2022 (18 births)
Io: Popularity Over Time
SSA records for Io span from the 2000s to the 2020s, covering 3 decades of naming data. The most popular decade for this name was the 2010s, when 109 babies were registered. While Io is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Io by Decade
How has Io 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.
Io by State
Io + Last Name Combinations
How many people share a full name with Io as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Io
Other first names starting with I with a similar number of bearers.
Io: Questions and Answers
How many people in the U.S. are named Io?
We estimate approximately 214 people named Io 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 1,601,656 Americans share this first name.
Is Io a common name?
Io is classified as "Very Rare" and is more popular than 75.1% of all first names in the SSA database. A total of 216 births have been registered with this name since 1880.
When was Io most popular?
Io reached peak popularity in 2022, when 24 babies were given this name. The average age of a living person named Io is approximately 11 years old, reflecting when the name was most commonly given.
Is Io a female name?
Io is predominantly female. 85.6% of people with this name are female. See the gender breakdown above for full details.
How many Io Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Io Smith, Io Johnson, Io 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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