Io
Feminine
Io is given to both — 190 girls and 36 boys since 1880. See other names given to both
Io entered the US charts in 2000, peaked at #6464 in 2022, ranks #14942 in 2025 — given to only a few children a year.
How old is the name Io?
Io first appears in US birth records in 2000 — 25 years ago. The typical Io is a kid of about 9 — this name's wave is very recent. About 200 people named Io are estimated to be alive in the US today.
When was the name Io most popular?
Io peaked in 2022, reaching #6464 nationally. Today it ranks #14942, 8,478 places below that high. See the whole 2022 chart.
Io appears on this list:
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 2000
- Most girls named
- 202218 — the highest on record
- Peak rank
- #6464reached in 2022
- Change vs 2023
- −50.0%5 in 2025, from 10
Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.
Ios among us
people named Io are estimated to be alive in the US today
About 1 girl in 321,453 born in 2025 was named Io
Estimated from SSA birth records and published actuarial life tables. Method
Is it right for you
What happens to a name after it peaks
The Jalana test
Every popular name lives one long story — a climb, a peak, a slow settling back. Io's later chapters haven't been written yet, so we borrowed them: Jalana climbed just as high around 1990, and its whole arc is on record. Line the two peaks up, and Jalana's path sketches the road Io is walking now.
Io sits in the calm middle of the cycle — neither chasing a wave nor sliding off one. Middle-of-the-cycle names age slowly and predictably.
A scored estimate from 146 years of naming cycles — not a prophecy. Great names outlive statistics. How this is scored
Io beside its neighbors
The names ranked closest to Io in 2025, in babies rather than position — the bars are to scale.
US girls given each name in 2025.
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Io
Feminine · #14942 in the U.S.
Frequently asked
- How many Ios are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 200 people named Io are estimated to be alive in the US today.
- How popular is the name Io in 2025?
- Io ranks #14942 among US girl names in 2025, with 5 babies given the name.
- How rare is the name Io?
- About 1 in every 321,453 US girls born in 2025 was named Io — 5 in all.
- Will my child share the name Io with classmates?
- Io will almost certainly be the only one in school.
Ranked beside Io
Names sitting at a similar level of popularity right now.
Hester#14942 · Lyda#14942 · Zula#14942 · Zona#14942 · Ula#14942 · Belva#14942 · Lucetta#14942 · Leala#14942
Looking for what else is popular rather than what resembles Io? See the current top 100.
Choosing between Io and another name?
See them side by side — full stats, history and a gentle verdict.
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Which one would you pick?
Your gut first, the numbers after — the split shows once you pick.
US figures from the Social Security Administration. 1880–2025. Data & methodology
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