Family name Diacu (Diacu 
) , worldwide, is a rare surname. The surname Diacu is habitual in Romania, where it is quite a rare surname, Austria, where it is a rare surname, and Portugal. Very seldom, Diacu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Diacu | United Kingdom, United States, Romania, Austria, Portugal |
| florin diacu Canadian mathematician, RO (b. 1959) |
|