Last name Коос (Koos 
, Коос 
) , across the world, is quite a common family name. The family name Коос is habitual in Hungary, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Slovakia. Measured by absolute frequency, it is commonest in Hungary, Germany, and the United States. Also, Коос is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koos | Netherlands, Germany, South Africa, United States, Hungary |
| Коос | Kazakhstan, Russia, Kyrgyzstan, Ukraine |