Cognomen Трейер (Treyer 
, Treier 
, Trejer 
) , all over the world, is quite a rare family name. The family name Трейер is characteristic of Estonia, where it is quite a common surname, Switzerland, and Germany, where it is a rare surname. Much less frequently, Трейер is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Treyer | Switzerland, France, United States, Germany, Italy |
| Treier | Switzerland, Estonia, United States, Germany, Italy |
| Trejer | Denmark, Estonia, United States, Italy |
| Трейер | Russia |
| эрго трейер EE |
|