Last name Баиер (Bayer 
, Baier 
, Баиер 
) , throughout the world, is a widespread cognomen. The cognomen Баиер is habitual in Vanuatu, where it is a common surname, Germany, where it is quite a common surname, and Austria (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Germany, the United States, and Turkey. Much less frequently, Баиер is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bayer | Germany, Turkey, Austria, United States, Brazil |
| Baier | Germany, Austria, Philippines, United States, Brazil |
| Баиер | Kazakhstan, Russia, Ukraine |
| Baiyer | Papua New Guinea, Brazil |