Throughout the world, Андрейус (Andrejus 
, Andreius 
, Андрейус 
) is a rare masculine first name. The forename Андрейус is habitual in Lithuania, where it is quite a common male name, Latvia, where it is a rare masculine name, and Albania. In absolute terms, it is commonest in Lithuania, the United Kingdom, and Romania. Very seldom, Андрейус is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Andrejus | Romania, United Kingdom, Spain, Lithuania, Albania |
| Andreius | Venezuela, Brazil, United States, Philippines |
| Андрейус | Russia, Ukraine |
| Andreyus | India, Brazil, Lithuania, United States |