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In the world, Ио (Io , Iou , Ио ) is quite a rare gender-neutral forename. The first name Ио is characteristic of Macao, where it is quite a common gender-neutral name, Greece, where it is quite a rare principally feminine, but very seldom male name, and Romania, where it is a rare unisex name. Measured by absolute frequency, it is the most numerous in Indonesia, Italy, and Greece. Likewise, Ио is the last name as well as the forename.
Ио is also a name for the fictitious and mythical characters: Io , the nymph seduced by Zeus in Greek mythology, Prometheus Bound; Io , the fictional character from Princess Connect!, Princess Connect! Re:Dive; Io , the fictional character from Granblue Fantasy; Io Otonashi , the fictional character from Place to Place and Io el Ciego , character in Discworld books.