The name Io is a boy's name meaning "rely on + emperor, rely on + hero".

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Io is most familiar to English speakers as a female name from Greek mythology, but in Japan it's used for both sexes.

The name Io peaked for boys at #9951 in 2020. Io is occasionally used for girls in 2025.

The name Io is a girl's name of Greek origin.

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Io may be one of the slightest names in the book, but there aren't many two-letter names with as much substance as this Greek mythological example.  Io, a name used for the largest moon of Jupiter, was in classic myth raped by Zeus and escaped from him by changing herself into a cow. 

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The name Io peaked for girls at #6548 in 2022. Io is occasionally used for boys in 2025.

Io

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