Worldwide, Diacu (Diacu 
) is a very rare female first name. The forename Diacu is habitual in Eastern Europe, particularly Romania, where it is a rare girly name. More prevalently, Diacu is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Diacu | Portugal, Austria, United States, United Kingdom, Romania |