All over the world, Трейер (Treyer 
, Treier 
, Trejer 
) is a very rare largely feminine, but seldom boy's given name. The forename Трейер is habitual in Sub-Saharan Africa, particularly South Africa, where it is a very rare girly name. Much more frequently, Трейер is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Treyer | Switzerland, France, United States, Germany, Italy |
| Treier | Switzerland, Estonia, United States, Germany, Italy |
| Trejer | Denmark, Estonia, United States, Italy |
| Трейер | Russia |