Last name Kaltner-Bayer (Kaltner-Bayer 
) , throughout the world, is an extremely rare family name. The last name Kaltner-Bayer is habitual in Western Europe, particularly Germany, where it is an extremely rare surname. Parts of the name also exists independently as a last name Kaltner, and a last name Bayer.
| VARIANT | COUNTRY |
|---|---|
| Kaltner-Bayer | Germany |