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Across the world, O. (O.
, О.
, أو
) is a common epicene first name. The given name O. is habitual in Indonesia, where it is quite a rare unisex name, Taiwan, where it is a rare masculine name, and Egypt, where it is a rare epicene name. In absolute terms, the name is most common in Indonesia, China, and Egypt. Very seldom, O. is the last name as well as the forename.
O. is also a name for the fictitious and mythical characters: Wendy O. Koopa , the fictional character from the Mario franchise, Super Mario Maker 2; O. Tidemann , character in Sesam Stasjon; O. Uplavici , the fictional author of a 1887 scientific article created by mistaken attribution, Dr O. Uplavici (1887-1938); O. Fanth Mzn , character in Bommelsaga and O.B. , the UK soap opera character, created 1997, Hollyoaks.