Total births
190
Unisex name · since 2000
Io
Since 2000, U.S. Social Security records show 190 babies named Io, peaking in 2022. See the year-by-year trend, decade totals, and state rankings below, sourced from federal birth data.
- 190
- total births
- 2000–2025
- years on record
- 2010s
- peak decade
- 51%
- born in that decade
Io is not among the current top-ranked girls names; 190 have been recorded since 2000.
Social Security Administration records show Io recorded 190 times among girls since 2000, though it doesn't currently rank among the most-used girls names, peaking in the 2010s. This profile derives year-by-year birth trends, decade totals, and state-level distribution directly from SSA birth-registration files spanning 2000 to 2025.
- 190 total births
- 2000–2025 years on record
- 2010s peak decade
- 51% born in that decade
Data updated Jul 2026
The verdict
190 girls have been named Io since 2000, peaking in the 2010s, last recorded in 2025.
- 190
- total births
- 2000–2025
- years on record
- 2010s
- peak decade
- 51%
- born in that decade
2010s
Peak decade
51% of everyone ever named Io was born in this single decade.
2022
Single peak year
18 babies were named Io in 2022 - its busiest year on record.
Io's usage pattern, beyond the headline number
Splitting Io's full recorded timeline at 2014, 61% of its total births fall in the more recent half of the record versus 39% in the earlier half -- usage has skewed toward the present, not a one-decade spike. Its quietest year on record was 2000, with just 5 recorded births -- worth weighing against the 2022 peak of 18 to see the full range of the name's swing in popularity.
Io at a glance
Last recorded 2025Peak year
2022
Current rank
Unranked
Active since
2000
Io popularity over time - girls
Annual U.S. births registered with the Social Security Administration · 2000–2025
- Peak year (2022)
- 18
- Annual births at peak, across 26 years of records
Io popularity over time - boys
36 total births recorded since 2014 (Io as boys' name)
Io by decade
Total births in each ten-year window, peak vs trough at a glance
2010s was Io's strongest decade.
96 babies received the name during that ten-year window, about 51% of all-time use.
Io births by decade
Total births in each ten-year window
- 2000s 35
2000s
35 births
- 2010s
2010s
96 births
- 2020s
2020s
59 births
What this shows Peak: 2010s at 96 births (51% of all-time use).
Io by state
Where Io concentrates geographically, total births since 2000
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | California | | 5 | 2.6% |
California share of Io's total US births 2.6%
5 of 190 births nationwide.
Frequently Asked Questions
How popular is the name Io? ▼
Io has been given to 190 babies in the U.S. since 2000, according to SSA data. Its last appearance in the data was 2025. 18 babies were born in 2022, its single highest year.
When was Io most popular? ▼
Io was most popular in the 2010s decade with 96 total births. The single peak year was 2022.
Where is Io most popular? ▼
The top states for the name Io are California (5 births).
Is Io a unisex name? ▼
Yes, Io is used for both boys and girls. As a girl's name it has 190 births, and as a boy's name it has 36 births.
How long has the name Io been used? ▼
The SSA has tracked Io since 2000 -- 26 years through the most recent 2025 data.
What names are similar to Io? ▼
Names with a similar sound or spelling include Iona, Ione, Iola, Ioanna, and 4 more. These share a common prefix and are also used for girls.
What to do with Io's data
- Io's usage has stayed within range of its 2010s decade-level peak (96 total births) through the 2020s (59) -- a comparatively stable name, not a fading trend.
- California records the most Ios (5 births) -- see the full state breakdown if geography matters to your decision. California names
- Weighing it against an alternative? Put two names side by side. Compare names
Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.
Keep exploring Io
Nearby Names Like Io
Names with a similar sound, spelling, or feel to Io
Iona Girl
#2778 12,251 births
Ione Girl
#7971 10,004 births
Iola Girl
#11127 9,659 births
Ioanna Girl
#8089 592 births
Ionia Girl
287 births
Compare Io side by side: Io vs Iona Io vs Ione Io vs Iola
Related Names
Names with a similar number of total births
Data Sources
Data as of July 2026. Source: U.S. Social Security Administration (SSA).
According to the Social Security Administration, this profile draws directly from the agency's public-use baby-name files (updated June 2026). See our methodology for the full extraction, aggregation, and privacy-suppression rules.
Primary: Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications, National Data, 2000–2025 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Io: Baby Name Since 2000 - 190 Births, Peak 2022." NameAlmanac. Accessed via https://namealmanac.com/name/io. Licensed CC BY-SA 4.0.
Name Almanac is rendered directly from the Social Security Administration's public baby-name files, no number is typed in by an editor. This profile for Io draws directly on SSA national and state-level files, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of July 2026.