Family name Declert (Declert 
) , across the world, is a very rare surname. The surname Declert is habitual in France, where it is a very rare surname, Argentina, where it is an extremely rare surname, and the United States. Much less frequently, Declert is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Declert | Brazil, France, Argentina, United States |