Cognomen واس (Wass 
, Waas , Wace 
) , all around the world, is a common last name. The family name واس is characteristic of Sri Lanka, where it is quite a common surname, Sweden, where it is quite a rare surname, and Netherlands. Measured by absolute frequency, the name is most common in Indonesia, Sri Lanka, and the United States. Very seldom, واس is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Waas, Wass | Germany, United Kingdom, United States, Indonesia, Sri Lanka |
| Wace | Australia, Canada, Morocco, United Kingdom, United States |
| واس | Sudan |