Surname Каас (Kaas 
, Каас 
) , worldwide, is quite a rare last name. The last name Каас is habitual in Northern Europe, particularly Denmark, where it is quite a common surname, Estonia, and Norway, where it is quite a rare surname. In absolute terms, it is commonest in Denmark, Germany, and the United States. Much less frequently, Каас is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kaas | Netherlands, France, United States, Denmark, Germany |
| Каас | Kazakhstan, Russia, Kyrgyzstan, Ukraine |