Cognomen Décoppet (Décoppet 
) , across the world, is an extremely rare family name. The surname Décoppet is habitual in Switzerland, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Décoppet | Switzerland, United States |
Patrick, Luc-Olivier, Natacha, Stéphane, and Alexandra