Last name Каер (Kayer 
, Kaer 
, Каер 
) , worldwide, is quite a rare surname. The last name Каер is habitual in Estonia, where it is quite a rare surname, Denmark, and Taiwan, where it is a rare surname. In absolute terms, it is commonest in Indonesia, Turkey, and the United States. Also, Каер is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kayer | Turkey, United States, Austria, India, Bangladesh |
| Kaer | Estonia, Indonesia, United States, India, Taiwan |
| Каер | Kazakhstan, Russia, Ukraine |