Family name Цаер (Caer 
, Tsayer 
, Tsaer 
) , worldwide, is a rare last name. The family name Цаер is characteristic of France, where it is a rare surname, Belgium, and Georgia, where it is a very rare surname. In absolute terms, the name is most common in France, Russia, and Belgium. Very seldom, Цаер is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Caer | Belgium, Malaysia, Philippines, United States, France |
| Tsayer | United States, Israel, Malaysia |
| Tsaer | Russia, Georgia |
| Цаер | Kazakhstan, Russia |