UK name, mostly girls
Io
A feminine name from Greek mythology referring to a priestess seduced by Zeus.
For 2026, the newest official UK baby-name figures on this page are from 2024. That release is the current official benchmark rather than a forecast.
Io is mostly registered for girls in the UK records. People looking for Io popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #4192, with 5 babies registered with the name. Its strongest year in the published records was 2021, with 9 births.
This profile covers 56 England and Wales registrations across 12 recorded years from 2003 to 2024. The figures come from ONS England and Wales, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.
The latest count is about 56% of the recorded peak, which gives a quick read on how the name has moved since its high point.
We estimate that about 56 living people in the UK are called Io. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2025 or 2026.
Key insights
- • Io ranked #4192 for girls in England and Wales in 2024, with 5 registrations.
- • The name peaked in 2021, when 9 girls were registered as Io.
- • About 56 living people in the UK are estimated to have Io as a first name, after adjusting past birth registrations with ONS life tables.
- • Across the England and Wales records shown here, 94.9% of Io registrations are for girls.
Latest rank (E&W)
#4192
2024
Births in 2024
5
Latest year
Peak year
2021
9 births
Estimated living
56
2026
Gender
Boy and girl registrations for Io
In England and Wales birth records, Io has been registered for both boys and girls. Across the years shown here, 5.1% of registrations are for boys and 94.9% are for girls.
These figures use the sex categories in the published baby-name files. They are useful for spotting how the name is used at registration, but they are not a live measure of gender identity or everyone living with the name today.
Io registered for boys
- Ranked #4,749 in 2018
- 3 boys registered in 2018
- Peak: 2018 (3 births)
Io registered for girls
- Ranked #4,192 in 2024
- 5 girls registered in 2024
- Peak: 2021 (9 births)
Meaning
What does Io mean?
Io is a given name with its origins in ancient Greek mythology. The name is derived from the Greek word "ion," which means "violet flower." It is closely associated with the mythological figure Io, a priestess of Hera who was turned into a heifer by Zeus to conceal their affair.
The earliest recorded use of the name Io can be traced back to ancient Greek literature, particularly Homer's Iliad and Ovid's Metamorphoses, where the story of Io's transformation is recounted. In these texts, Io is depicted as a tragic figure, subjected to the whims of the gods and ultimately transformed into a wandering, tormented creature.
Throughout the centuries, the name Io has been borne by various notable individuals. One of the earliest recorded examples is Io of Chios, a renowned Greek poet and writer who lived in the 5th century BCE. She is credited with the invention of the literary genre known as "Iambic verse."
In the realm of astronomy, Io is also the name of one of the four largest moons of Jupiter, discovered by Galileo Galilei in 1610. This celestial body was named after the mythological figure, further cementing the name's place in history.
Another famous bearer of the name was Io Chirica (1888-1935), a Romanian poet and writer known for her contributions to the Symbolist movement. Her works explored themes of love, nature, and the human condition, earning her critical acclaim during her lifetime.
Moving into the 20th century, Io Fuller (1923-2015) was an American author and editor who played a significant role in the Science Fiction and Fantasy genres. She co-founded the prestigious Nebula Awards and served as the president of the Science Fiction and Fantasy Writers of America.
More recently, Io Tillett Wright (born 1986) is an American artist, activist, and television personality known for their work in LGBTQ+ advocacy and representation. Their photography project, "Self Evident Truths," aimed to capture the diversity and resilience of the LGBTQ+ community.
While not an exhaustive list, these examples showcase the rich history and diverse individuals who have borne the name Io throughout the centuries, spanning literature, mythology, astronomy, and various creative fields.
Sourced from namecensus.com.
Popularity
Io over time
The chart below compares boys and girls registered as Io in England and Wales, from 2003 to 2024. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.
For Io, the clearest high point is 2021. The latest England and Wales figure is 5 births in 2024, compared with 9 at the peak.
Babies born per year
Decades
Io by decade
Decade totals smooth out the yearly jumps and make it easier to see whether Io was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.
| Decade | Average rank | Total births | Years covered |
|---|---|---|---|
| 2020s | #3941 | 28 | 5 |
| 2010s | #4561 | 22 | 5 |
| 2000s | #4787 | 6 | 2 |
Related
Names similar to Io
- Isabella 58,822
- Isla 51,854
- Isabelle 46,163
- Imogen 33,758
- Ivy 23,306
- Isabel 20,895
- Isobel 19,706
- Iris 10,353
- India 8,371
- Iqra 4,452
- Indie 3,873
- Iona 3,682
FAQ
Io: questions and answers
How popular is the name Io in the UK right now?
In 2024, Io was ranked #4192 for girls in England and Wales, with 5 births registered.
When was Io most popular?
The peak year on record was 2021, with 9 babies registered as Io in England and Wales.
What is the meaning and origin of Io?
A feminine name from Greek mythology referring to a priestess seduced by Zeus.
How many people are called Io in the UK?
A total of 56 babies have been registered as Io across the 12 years of ONS England & Wales records shown here.
Which records is this page based on?
The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.