Io
Girl nameIo has been given to 226 babies in the U.S. since 2000. It peaked in 2022. In 2025, about 1 in 321,453 girls was named Io.
Popularity over time births per year, 1880–2025
Total babies
226
Peak year
2022 (24 babies)
Rank in 2025
Below top 1000
First recorded
2000
10-year trend
▼ -9%
Gender split
84% girls / 16% boys
Spellings & variants
Names one letter away from Io — alternate spellings parents actually use.
Names with a similar vibe
Same primary gender, peaked around the same years, and roughly as common as Io.
Sibling name ideas for Io
Same era and popularity as Io, avoiding matching initials or rhymes.
FAQ
How popular is the name Io?
Io has been given to 226 babies in the U.S. since 2000. It ranked below the top 1000 in 2025.
When did the name Io peak?
Io peaked in 2022, when 24 babies were given the name.
Is Io a girl or boy name?
Io is primarily a girl name (84% of babies named Io are girls).
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