Cognomen Guilfer (Guilfer 
, Гильфер 
) , globally, is a very rare surname. The surname Guilfer is characteristic of Kazakhstan, where it is a rare surname, Kyrgyzstan, where it is a very rare surname, and Russia. Very seldom, Guilfer is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guilfer | Philippines, Peru, Brazil, Mexico, Venezuela |
| Гильфер | Kazakhstan, Russia, Kyrgyzstan |