unisex name
Io
- Gender Unisex
- Syllables 2
- Letters 2
- Popularity Rare
- Births on record 285
Io is a unisex name with 2 syllables. It is given to both girls and boys — about 86% of recorded births with this name are girls. In 2025 it was given to 10 babies in the United States. It is a rare choice.
- Peaked in 2022, when 24 babies were given the name.
- It has been rising over the past decade.
- Today about 1 in 331,565 babies in the United States is given this name.
- First appears in US birth records in 2000.
- 2 syllables, with the stress on syllable 1.
Io over time
Births per decade in the United States, 2000s to 2020s. The striped bar is the 2020s, still in progress — it covers 2020 to 2025, not a full ten years.
Show the numbers
| Decade | Births |
|---|---|
| 2000s | 35 |
| 2010s | 109 |
| 2020s (to 2025) | 82 |
How popular is Io?
In 2025, Io was given to 10 babies in the United States. It is a rare choice.
Where Io is used
US figures omit any name given to fewer than five babies in a year, so the rarest names are absent from the source rather than absent from use. Data & sources.
Names that peaked alongside Io
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Parents who like Io also like
Names whose popularity has risen and fallen in step with Io over the last century — the same taste, a different name.
Sibling names for Io
Names from the same era that won't rhyme or share an initial with Io — the two things that make a sibling set grate.
Common questions about Io
How popular is the name Io?
In 2025, Io was given to 10 babies in the United States. It is a rare choice.
Is Io a girl's or a boy's name?
Io is used for both girls and boys. About 86% of recorded births with this name are girls.
How many syllables are in Io?
Io has 2 syllables.
When was Io most popular?
Io peaked in 2022, when 24 babies were given the name. It has been rising over the past decade.
Is Io a good name?
That is not something records can settle, but they can tell you what you would be choosing. Io currently ranks #13,380 in the United States. It has been rising over the past decade. Everything else — how it sounds with your surname, who it reminds you of — is yours.