Surname سايو (Sayo 
, Sayu 
, Saio 
) , in the entire world, is a common last name. The last name سايو is characteristic of Philippines, where it is quite a rare surname, Nigeria, and United Arab Emirates. Measured by absolute frequency, it most frequently occurs in Nigeria, Philippines, and Indonesia. Likewise, سايو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sayo | Kenya, Indonesia, Japan, Philippines, Nigeria |
| Sayu | Malaysia, Indonesia, Japan, Philippines, Nigeria |
| Saio | Indonesia, Japan, India, Philippines, Nigeria |