Around the globe, Deac (Deac 
, Deák 
, Дяк 
) is a rare epicene forename. The first name Deac is habitual in Romania, where it is quite a rare gender-neutral name, Hungary, where it is a rare unisex name, and Italy, where it is a very rare gender-neutral name. More prevalently, Deac is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Deac | Germany, Romania, Italy, Spain, United States |
| Deák | Romania, Spain, Hungary, Serbia, Slovakia |
| Дяк | Kazakhstan, Russia |
| دياك | Palestinian Territory, Jordan |
| radu deac Romanian physician, RO (b. 1940) |
|