Io
- US rank
- #14,942
- Syllables
- 1
- Peak
- #6,464 in 2022
5 babies were named Io in the US in 2025. It has dropped 5,989 places in five years.
Found on lists
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US births per million girls, 2000–2025
US births per million boys, 2014–2025
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Io you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- How commonAbout 1 in every 322,581 baby girls born in the US in 2025 was named Io, 5 babies in all. In a typical school of 500 kids, your Io would very likely be the only one.
- HistoryIo first shows up in US birth records in 2000, the first year at least 5 babies got it. That makes it a fairly new name, younger than many of today's parents.
- Best yearIts best year was 2022, when it reached #6,464.
- TrendIo has slipped 5,989 places over the last five years and now sits at #14,942. Good news if you want a familiar name that fewer kids will share.
- Boy or girlIo is given to both boys and girls: 50% of the 10 babies named Io in 2025 were boys. That makes it one of the names that truly works for either.
About the name Io
Io is a gender-neutral name. It has 2 letters and 1 syllable, starting with I and ending in “-io”. US birth records list Io for girls from 2000 to 2025, in 21 of those 26 years. Its best year was 2022, when it ranked #6,464 among girl names. In 2025 it ranked #14,942, with 5 babies. Of the 10 US babies named Io in 2025, 50% were girls and 50% were boys.
| Decade | Babies per million | About 1 in |
|---|---|---|
| 2000s | 1.9 | 531,915 girls |
| 2010s | 5.5 | 182,482 girls |
| 2020s | 6.0 | 165,746 girls |
| Decade | Babies per million | About 1 in |
|---|---|---|
| 2010s | 1.1 | 895,522 boys |
| 2020s | 2.2 | 451,128 boys |
Questions about the name Io
Is Io a boy or girl name?
Both. Io is used for boys and girls: in 2025, 50% of US babies named Io were girls.
How popular is the name Io?
Io ranked #14,942 for US girls in 2025, given to 5 babies. Its best year was 2022 (#6,464).