Last name มาสุ (Masu 
, มาสุ 
) , across the world, is quite a common surname. The cognomen มาสุ is habitual in Botswana, where it is quite a rare surname, Papua New Guinea, and Italy. In absolute terms, the name is most common in India, Nigeria, and Italy. More frequently, มาสุ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Masu | Italy, Japan, Nigeria, India, Myanmar |
| มาสุ | Thailand |