Cognomen צ'אד (Chad 
, צ'אד 
) , in the world, is a common last name. The surname צ'אד is habitual in Aland Islands, where it is quite a common surname, Oman, where it is quite a rare surname, and Bangladesh. In absolute terms, the name is most common in Bangladesh, India, and the United States. Much more prevalently, צ'אד is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Chad | Australia, Bangladesh, Canada, United States, India |
| צ'אד | Israel |