Worldwide, Kiffer (Kiffer 
, Kiffen 
) is a very rare epicene forename. The first name Kiffer is habitual in Northern America, particularly the United States, where it is an extremely rare epicene name. More frequently, Kiffer is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Kiffer | Germany, United States, France, Brazil, Democratic Republic of the Congo |
| Kiffen | Germany, Angola, France, Brazil, Netherlands |