Cognomen Onyou (Onyou 
) , globally, is a very rare last name. The surname Onyou is characteristic of Australia, where it is a very rare surname, Thailand, where it is an extremely rare surname, and Malaysia. Measured by absolute frequency, it is the most numerous in China, Australia, and Thailand. More frequently, Onyou is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onyou | Australia, China, Thailand, United States, South Korea |