In the world, サウ (Sau 
, Sáu 
, Sa'U 
) is a widespread primarily feminine, but very seldom masculine first name. The forename サウ is characteristic of Macao, where it is quite a common girly name, Hong Kong, where it is quite a common largely female, but infrequently boy's name, and India, where it is quite a rare predominantly girly, but very infrequently male name. Not in comparison with a country's population, it is the most numerous in India, the United States, and Vietnam. More frequently, サウ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sau | Taiwan, India, Myanmar, Vietnam, Indonesia |
| Sáu | United States, Vietnam, Macao |
| Sa'U | United States, Australia, Indonesia, New Zealand |