Last name Геыдт (Геыдт 
, Geydt 
) , in all the world, is a very rare family name. The cognomen Геыдт is characteristic of Russia, where it is a very rare surname, and Germany, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Геыдт | Russia |
| Geydt | Germany |