Surname 诺尔 (Knorr 
, 诺尔 
, Knower 
) , in the entire world, is a common family name. The last name 诺尔 is habitual in Germany, where it is quite a common surname, Denmark, where it is quite a rare surname, and Paraguay. In absolute terms, it is commonest in Germany, the United States, and Denmark. Very seldom, 诺尔 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Knorr | Germany, United States, India, Canada, Denmark |
| 诺尔 | China |
| Knower | Germany, Spain, Australia, United States, India |
| Nøhr | Denmark, United States, Australia |