Family name Estel-Knoop (Estel-Knoop 
) , throughout the world, is an extremely rare last name. The surname Estel-Knoop is habitual in Western Europe, particularly Germany, where it is an extremely rare surname. Parts of the name also exists independently as a first name Estel, and a last name Knoop.
| VARIANT | COUNTRY |
|---|---|
| Estel-Knoop | Germany |