Across the world, أو (O 
, O. , Ou 
) is a common gender-neutral first name. The first name أو is habitual in Tunisia, where it is quite a common epicene name, Indonesia, and Algeria, where it is quite a rare dominantly boy's, but uncommonly female name. Not in comparison with a country's population, it is the most numerous in Indonesia, India, and China. Likewise, أو is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| O., O | China, Canada, Japan, Venezuela, Indonesia |
| Ou | Myanmar, China, Canada, Venezuela, Indonesia |
| أو | Egypt, Morocco |
أو is also a popular name for the fictitious and mythical characters: Wendy O. Koopa , the fictional character from the Mario franchise, Super Mario Maker 2; O Menino Triste ; O Analista de Bagé ; O. Tidemann , character in Sesam Stasjon and O Gralha , the Brazilian comics character, and in many other works.