BABY NAMES
Io
Greek
 Up in popularity
 Down in popularity
 Best bet
 Unisex
Who would have imagined that a name made up entirely of vowels could be so charming? In Greek mythology, Io was one of Zeus' paramours, and it is also the name of one of Jupiter's moons, making it an endearingly quirky name for a girl who loves to gaze up at the night sky.

Variations
Eyo
Popularity rankings from the Social Security Administration
Io
About name popularity rankings
You may find some surprises -- for example, who knew Jennifer was a boy's name? Because this feature uses actual Social Security data, it includes the human error that attends a large survey, but it still reliably reflects the patterns of naming fashion.