Family name Giass (Giass 
) , around the globe, is an extremely rare cognomen. The last name Giass is habitual in Italy, where it is an extremely rare surname, the United States, and Brazil. Much more prevalently, Giass is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Giass | Bangladesh, Pakistan, Oman, Saudi Arabia, India |