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Worldwide, Ō (Oo , Oh , О ) is a widespread epicene given name. The given name Ō is characteristic of Mongolia, where it is a widespread epicene name, Myanmar, where it is quite a common principally boy's, but scarcely girly name, and Singapore, where it is quite a rare gender-neutral name. In absolute terms, the name is most common in India, Mongolia, and China. More frequently, Ō is the last name as well as the forename.
Ō is also a name for the fictitious and mythical characters: Oh , the fictional character; Oh Dae-su , the Fictional character, Oldboy and Oh Sang Ryong .