Last name Diefer (Diefer 
) , globally, is an extremely rare family name. The cognomen Diefer is habitual in Honduras, where it is a very rare surname, Germany, where it is an extremely rare surname, and Venezuela. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Honduras. More frequently, Diefer is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Diefer | Germany, Colombia, Spain, Brazil, United States |