Name Awesome

Io

#15,811 in 2025UnisexGirls' nameBoys' name

Meaning uncertain in the cited reference

Io has been given to 226 babies in the U.S. since 2000. In 2025 it ranked #15,811 of 17,293 girls’ names in use. Its peak year was 2022, with 18 recorded. It's used for both sexes: 84% girls, 16% boys all-time.

Babies named Io, 2025

1 in 663,000

Io over time, 1880–2025

GirlsBoys
0510152018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Girls or boys — Io over time

In 2025, Io went to 50% girls and 50% boys.

20002025

A sex is only published in years it reached five applications, so a stretch at 0% or 100% means the other side stayed under that floor — not that it was never used.

Io: meaning, origin, and history

Meaning uncertain in the cited reference

Deeper origin not confirmed in the cited records

What Io means

Io is a given name.

Documented naming usage and pronunciation

Io is used in Greek Mythology.

Another recorded pronunciation is /iː.ɔ̌ː/ and /ˈaɪ.oʊ/ for Io.

American usage and historical context

In the United States, 190 girls were recorded with the name Io between 2000 and 2025. Its highest annual count was 18 in 2022; its best national rank was #6,548 in 2022.

Over 5 years its rank fell, from #9,172 in 2020 to #15,811 in 2025. Over 10 years its rank rose, from #17,490 in 2015 to #15,811 in 2025.

In the United States, 36 boys were recorded with the name Io between 2014 and 2025. Its highest annual count was 7 in 2014; its best national rank was #9,948 in 2020.

Over 5 years its rank fell, from #9,948 in 2020 to #12,740 in 2025. Over 10 years its rank fell, from #11,213 in 2015 to #12,740 in 2025.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

How common is Io?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 663,000
5 of 3,315,165 births
Among girls only
1 in 321,000
<0.01% of girls
Rank, 2025
#15,811
of 17,293 girls’ names in use
Coin-flip room size
459,581 kids
Even odds of a second one

Where Io sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

Chance at least one other child shares the name

If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 459,581 children born in 2025 and it's an even bet that one of them is another Io. In a class of 30 the chance is Under 1%.

When Ios were born

Half of everyone ever recorded as Io was born before 2016 — so the typical Io is around 9 today.

Median birth year
2016
About 9 years old
Biggest decade
2010s
50.5% of all use
Born in the last 25 years
97.4%
A modern name
Recorded since 1950
190
People you could plausibly meet
Choose a decade

2010s — 50.5% of all recorded uses (96).

Is Io rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
—
Not ranked then
Rank vs 5 years ago
−6,639
Places dropped
Rank vs 10 years ago
+1,679
Places climbed
Births vs 10 years ago
1.00×
More babies than then
Share of its own peak
27.8%
Peak was 2022 (18)
Years since peak
3
Years
Year-to-year steadiness
Volatile
46.5% average annual change
Best rank ever
#6,548
2022

Where Io is used

Across 1910–2025, Io was most concentrated in California — about 1 in — girls, against 1 in 3,202,555 across all states with data.

00 per 100,000

Most concentrated

  1. 1California1 in —

Shading is the share of that state's recorded girls given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Io has too little recent state data to map, so this covers all years from 1910.

Io around the world

Where Io ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    2003–2024
    #4,193
    in 2024
  • South Australia
    2011–2011
    #840
    in 2011

Popularity data from Office for National Statistics and Consumer and Business Services (South Australia). ONS data under Open Government Licence v3.0. CBS SA data under CC BY 4.0.

Io by the numbers

The raw record for each sex the name is used for.

As a girl's name

Rank in 2025
#15,811
Trend vs 5 yrs ago
Down 6,639
Best rank ever
#6,548
2022
Peak year
2022
18 that year
First recorded
2000
Last recorded
2025
All-time count
190
Count in 2025
5

As a boy's name

Rank in 2025
#12,740
Trend vs 5 yrs ago
Down 2,792
Best rank ever
#9,948
2020
Peak year
2014
7 that year
First recorded
2014
Last recorded
2025
All-time count
36
Count in 2025
5

Names similar to Io

Matched on shared beginnings and endings, similar length, and comparable popularity.

MioIonnaIomaIoanaGioIolanaIolaniIowaIoniaIoannaClioRioKleioIoleLirioIolaIoneJulioIoleneIoniIonaXioIolandaSergio

Sibling names for Io

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Io

Top names of 2022, Io's peak yearThe 2020s in fullOther names that peaked in 2022Girls' names starting with IMoon-Inspired Names